Exam Revision for Engineering Graphics and Design: both papers question by question, real mark-weighting bands, the mistakes that cost marks, and a time-budget strategy for all 400 marks.
Exam Revision · Topic 1Exam Format and Mark Allocation
You already know what each question covers. This page is about turning that knowledge into marks: how the paper is shaped, where the big marks sit, and the exact habits that lose or save marks before you have even drawn a line.
📖 KEY DEFINITION
Grade 12 sits two separate papers, each written over 3 hours for 200 marks, and each scaled down to a 100-mark NSS contribution. Paper 1 is civil work in first-angle projection; Paper 2 is mechanical work in third-angle projection. Both papers are built from exactly four questions, and both follow the same underlying weighting shape.
The weighting bands, side by side
Q
Paper 1 focus (civil)
Weighting
Paper 2 focus (mechanical)
Weighting
1
Civil-Analytical (title block, site plan, floor plan facts)
~15% (around 30 marks)
Mechanical-Analytical (detail drawing, assembly, isometric, title block facts)
~15% (around 32 marks)
2
Interpenetration and Development and/or Solids
~20% (around 39 marks)
Loci (helix and/or cam and/or point(s) of a mechanism)*
~20%
3
2-point Perspective Drawing
~20% (around 35 marks)
Isometric Drawing*
~20% (around 44 marks)
4
Civil working drawing, including electrical accessories
~45% (around 96 marks)
Mechanical Assembly
~45% (around 81 marks)
The percentages are the guideline weighting; the mark figures are one sitting's actual split, which is why 96 marks reads as 48% and not exactly 45%. Learn the shape from the percentages and the sub-mark detail from the marks. *Loci and Isometric Drawing always carry the ~20% + ~20% weighting on Paper 2, but the exact question number they sit under can swap between sittings. Read the question number on the paper in front of you, never assume Q2 is always Loci.
⭐ EXAM FAVOURITEQuestion 4 is the anchor question of every paper, worth roughly double Q2 or Q3 on its own and about triple Q1. It is also physically the last question on the sheet, so it is the one most at risk when time runs short. Treat Q4 as the question you protect first when you plan your three hours, not the one you squeeze in at the end.
Turning the weighting into a time budget
A simple, defensible way to divide 180 minutes: give each question the same share of time as its share of marks.
Cognitive level split (combined across both papers)
Level
Share
What it looks like on the page
Lower order
~30%
Knowledge and recall: reading a title block, naming a line type, stating a definition
Middle order
~40%
Analysis and application: completing a view, calculating a dimension, applying a known construction to a new shape
Higher order
~30%
Create and evaluate: developing a surface, resolving an interpenetration, completing a full working/assembly drawing
Middle order is the single biggest slice. The paper is not mostly a memory test; it mostly rewards correctly applying a construction method you already know to a shape or scenario you have not seen before.
🔥 FREQUENTLY TESTED
Three instructions are printed on every paper, every year, and each one carries real, checkable marks:
Work at a scale of 1:1 unless a different scale is stated for that specific question.
Staple all sheets together in the correct numbered order and submit every sheet, whether you answered that question or not.
Where a dimension or a detail has been omitted from the question, use your own discretion to complete it sensibly and keep drawing rather than leaving a gap.
Four checks before you draw a single line
⚠️ COMMON MISTAKE
Drawing Paper 1 civil views with third-angle symbols out of habit from Paper 2 practice, or the reverse.
Assuming Paper 2's Loci question is always Q2: check the actual question number before you start, because Loci and Isometric can swap places between sittings.
Spending roughly equal time on all four questions instead of proportional time, then rushing or abandoning part of Q4, the single most expensive question to lose marks on.
Leaving out a sheet for a question that "wasn't attempted" instead of stapling it in anyway.
💡 EASY MARK
Correct sheet order at hand-in, defaulting to a 1:1 scale when none is stated, and sensibly completing an omitted dimension instead of leaving a blank space, cost nothing in drafting skill. They are marks purely for following the printed instructions.
SBA: how the exam fits into your final promotion mark
Component
Weighting toward final promotion mark
All tests
7.5%
All course drawings (KTs)
7.5%
Half-year exam + preliminary exam
10%
PAT (Practical Assessment Task)
25%
NSS exam (Papers 1 & 2 combined)
50%
⚡ MUST MEMORISE
Both papers share the same shape: Q1 ~15%, Q2 ~20%, Q3 ~20%, Q4 ~45%.
SBA into the final mark: tests 7.5%, drawings 7.5%, half-year + prelim 10%, PAT 25%, NSS exam 50%.
Standing rules: scale 1:1 unless stated, staple everything in order, use your own discretion for omissions.
Know the shape of the paper as well as you know the shape of the drawing.- plan the hour before you plan the line
🧠 ACTIVE RECALL
Which question in either paper carries the largest share of the marks?(1)
Using the 15/20/20/45 weighting, roughly how many of the 180 minutes should Question 4 get?(1)
Which statement about Paper 2's Loci and Isometric Drawing questions is TRUE?(1)
A question in Paper 1 gives no scale at all. What scale should you use?(1)
You ran out of time and never attempted Question 3. What must you do with that sheet?(1)
Combined across both papers, which cognitive level carries the biggest share of marks?(1)
Apart from the NSS exam itself, which single SBA component carries the most weight toward your final mark?(1)
Which pairing is correct?(1)
Explain how you would divide your three hours across the four questions of a paper, and justify why an even split across all four is a poor strategy. (5)
Name three instructions printed on the exam paper that apply no matter which question a candidate is answering. (4)
A candidate spends too long perfecting Question 1 and is forced to leave Question 4 mostly blank. Explain, in terms of mark weighting, why this is the costliest possible mistake in either paper. (4)
Explain to a Grade 8: why should you never treat all four questions in an EGD paper as equally important when planning your time?
ONE-MINUTE SUMMARY
Two 3-hour, 200-mark papers, each 100 marks toward the NSS: Paper 1 civil in first-angle, Paper 2 mechanical in third-angle, both shaped 15% / 20% / 20% / 45% across four questions. Question 4 is always the anchor question, worth roughly 80 minutes of a 180-minute paper, and the one to protect first. Cognitive levels combine to about 30% lower, 40% middle and 30% higher order. The standing rules (1:1 unless stated, staple everything in order, own discretion for omissions) are free marks that have nothing to do with drafting skill. Toward your final promotion mark: tests 7.5%, course drawings 7.5%, half-year plus prelim 10%, PAT 25%, NSS exam 50%.
IN THE EXAM
Where: this is the shape of the whole paper, not a single question; use it to plan before Question 1.
Typical traps: even time-splitting across all four questions, assuming Paper 2's question order never changes, mixing up first-angle and third-angle habits between papers, or dropping a sheet because "it wasn't attempted."
What earns marks: a time budget that matches the 15/20/20/45 shape, correct sheet order at hand-in, defaulting to 1:1 when no scale is given, and sensible discretion on any omitted dimension.
Paper 1 (Question 1) · Civil-AnalyticalCivil-Analytical
⭐ EXAM FAVOURITE
Question 1 hands you a real-looking title block plus a site plan or floor plan extract, then a table of short-answer questions worth about 30 marks (roughly 15% of Paper 1). Most rows are worth only 1 mark for reading a single fact straight off the drawing, with a handful of 2 to 3 mark rows for a small perimeter or area calculation. If you know exactly where to look, this is the fastest, most reliable set of marks in the entire subject, done and dusted before the harder questions even start.
Scan a title block and site plan once in a fixed order before answering any row of the question table
Read a firm name, address, telephone number, email address, scale or projection system straight off the title block
Write out what a floor plan or site plan abbreviation stands for, checking the symbol beside the letters rather than the letters alone
Count how many of a stated feature appear on the plan, scanning the whole sheet systematically
Name the colour used for a new or existing material, and name the material that a given colour represents
Identify the feature that a numbered leader line is pointing at
Calculate a perimeter or a floor area from the dimensions on the plan, converting millimetres to metres first
What a title block and a site plan actually give you
📖 KEY DEFINITION
A title block (or name block/panel) is the boxed strip on a drawing sheet that records who made the drawing, what it is, and how to read it: drawing title and project description, drawing/reference number, sheet number, scale, projection symbol, drawn-by/reviewed-by names, dates, and the drawing office's contact details. A site plan is a scaled bird's-eye view of a whole erf (stand), showing the boundary and building lines, the position of the building(s), access, services such as drainage and water lines, and natural features, always drawn at a much smaller scale than a floor plan since it covers the whole property.
The question styles that repeat every single year
Question style
What it really tests
Typical marks
Where to look
Contact / firm detail
Reading a name, address, phone number or email straight from the title block
1
Title block, drawing office box
Scale / projection
Reading the stated scale or naming the projection system used
1
Title block "scale" field
Abbreviation meaning
Writing out what a two or three letter abbreviation stands for
1
Anywhere on the plan, near the symbol used
Count a feature
Counting how many of an item (a fixture, a chamber, a parking bay) appear
1
Scan the whole plan systematically
Colour convention
Naming the colour used for new/existing material on the plan
1
Legend or shaded areas
Name the labelled feature
Naming what a numbered call-out or arrow is pointing at
1
Numbered leader lines on the plan
Small calculation
Perimeter or floor/site area from given dimensions
2 to 3
Dimension lines around the shape
🔥 FREQUENTLY TESTED
The mark allocation tells you the strategy: with roughly twenty-something 1-mark rows and only two or three heavier rows, do the 1-mark rows first, in the order they appear, then come back for the perimeter/area calculations once you have banked the easy marks. Never leave a 1-mark row blank while you struggle with a calculation.
Abbreviations you must recognise on sight
⚡ MUST MEMORISE
Abbreviation questions only cost you a mark if you freeze. Read the whole list until each one is instant recall, not a guess.
Floor plan and elevation abbreviations
B Bath, WB Wash Basin, S Sink, SH Shower
WC Water Closet (toilet), U Urinal, BT Bidet, WT Wash Trough
BIC Built-in Cupboard, G Gully, RWDP Rainwater Down-Pipe, NTS Not To Scale
BL Building Line, MH Man Hole, IC Inspection Chamber, IE Inspection Eye
IP Inspection Pipe, RE Rodding Eye, ST Septic Tank, SWD Stormwater Drain
WP Water Pipe, G Gully, RWDP Rainwater Down-Pipe, NTS Not To Scale
Drainage abbreviations (IC/IE/IP/RE/MH) look alike; read the small circle or symbol next to the letters, not just the letters, before you answer.
⚡ MUST MEMORISE
Colour convention for new work on floor plans and site plans: red new masonry, green new concrete, blue new iron or steel, yellow new wood, black new glass, grey existing material of any type (only new proposed work is coloured on a site plan; existing work stays uncoloured). Also fix in memory: a load-bearing (usually outer) wall is drawn 220 mm thick and a non-load-bearing (usually inner) wall is drawn 110 mm thick on a floor plan, a common "what does this thickness tell you" trap.
The 90-second scan technique
Do not read the questions first and go hunting. Scan the whole sheet ONCE in a fixed order, then answer the table in order. That one habit alone is worth several extra marks under time pressure.
Reading a site plan under time pressure
💡 EASY MARK
A site plan always shows the same five zones. Find each zone once, and every counting/labelling question becomes a quick lookup instead of a fresh search: the north point and erf boundary, the building line(s) and setback distances, the building footprint itself, the service lines (drainage, water, stormwater), and the dimension chain running along the boundary edges.
Worked example: our own title block and site plan extract
Worked example · a small invented civil-analytical extract
Scenario: A site plan and title block for a proposed new ablution block at Dolphin Bay Caravan Park. Title block reads: drawing office Kaya Design Studio, 14 Vygie Close, Knysna, tel 044 382 910, email studio@kayadesign.co.za; drawing title "Proposed Ablution Block, Erf 61, Dolphin Bay"; drawn by T. Adams, reviewed by M. Okoro; drawing number KDS/07/24; scale 1:200. The site plan shows the erf boundary, a building line 4,5 m from the road boundary, the ablution block footprint, two inspection chambers (IC) and one manhole (MH) along the southern service line, and a stormwater drain (SWD) running along the eastern boundary. New concrete paving in front of the block is shaded green.
#
Question
Model answer
Marks
1
What is the email address of the drawing office?
studio@kayadesign.co.za
1
2
To what scale was the site plan drawn?
1:200
1
3
What does the abbreviation MH mean?
Man Hole
1
4
How many inspection chambers (IC) are shown on the site plan?
Two
1
5
What colour is used for the new concrete paving, and what does that colour indicate?
Green; it indicates new concrete
2
Notice every answer above sits in plain sight once you know the five scan zones: the email lives in the title block's drawing-office box, the scale in the title block's scale field, and the abbreviation/count/colour answers live directly on the site plan next to their symbols.
⚠️ COMMON MISTAKE
Mixing up similar drainage abbreviations: IC, IE, IP, RE and MH all describe different drainage fittings; do not guess from the letters alone, check the actual symbol.
Forgetting to convert units: when dimensions are given in millimetres, convert to metres (divide by 1000) before calculating a perimeter or an area; markers want the final answer in metres or square metres.
Answering the wrong direction of a colour question: if asked what colour represents new steelwork, answer with the colour (blue), not the material, and vice versa when asked what a colour represents.
Skipping a 1-mark row because it "looks too easy": a blank row is a guaranteed zero; a wrong guess still costs nothing extra, so always write something.
Not using the given scale correctly: a stated scale of 1:200 means every 1 unit on paper equals 200 units in real life; do not confuse this with the ratio used for a floor plan (1:50) on the same sheet.
💡 EASY MARK
Roughly two-thirds of Question 1's marks need nothing more than careful reading: no formula, no construction, no drawing skill. Practise scanning ten different invented title blocks and site plans in one sitting and this becomes the fastest 20+ marks you will ever earn in an EGD paper.
The easiest marks in the whole exam are the ones you already know how to find, so find them first.- bank Question 1 before the clock gets tight
🧠 ACTIVE RECALL
On a floor plan, the abbreviation BIC means ...(1)
DPC, as shown on a sectional elevation, stands for ...(1)
According to the standard colour convention, RED on a floor plan or site plan indicates ...(1)
On a site plan, existing structures that are not being changed are normally shown as ...(1)
A load-bearing (typically outer) wall is normally drawn on a floor plan at a thickness of ...(1)
On a site plan, the abbreviation IC refers to a ...(1)
Before calculating a perimeter from dimensions given in millimetres, you should first ...(1)
Question 1 (Civil-Analytical) on Paper 1 is worth approximately ...(2)
Explain why scanning the whole title block and site plan ONCE, in a fixed order, before answering any question in the table is a better strategy than reading the questions first. (3)
A learner counted every "IC" on a site plan as an "IE" and lost the mark. Explain the mistake and how to avoid it in future. (4)
List the standard colour convention used for NEW materials on a floor plan or site plan, and explain how existing structures are shown differently. (6)
Explain to a Grade 8 learner why Question 1 can earn you 30 marks without drawing a single line.
ONE-MINUTE SUMMARY
Question 1 (Civil-Analytical) is worth about 30 marks (roughly 15% of Paper 1): a table of mostly 1-mark questions read straight off a title block and a site plan or floor plan, plus two or three heavier perimeter/area rows. Scan once in a fixed order (title block fields, then the site plan's five zones), know every abbreviation (BIC, DPC, FFL, NGL, IC, IE, MH, RWDP, BL, SWD and more) and the colour convention (red masonry, green concrete, blue iron/steel, yellow wood, black glass, grey existing) cold, convert mm to m before any calculation, and never leave a 1-mark row blank.
IN THE EXAM
Where: Paper 1, Question 1, around 30 marks, first question on the paper.
What earns marks: a fixed scan order before answering, abbreviations known cold, units converted before any calculation, and every row attempted, even the ones that "look too easy".
🔒 PAPER 1 Q2: INTERPENETRATION, DEVELOPMENT AND SOLIDS
🔒 PAPER 1 Q3: 2-POINT PERSPECTIVE
🔒 PAPER 1 Q4: CIVIL WORKING DRAWING
🔒 PAPER 2 Q1: MECHANICAL-ANALYTICAL
🔒 PAPER 2 Q2/Q3: LOCI
🔒 PAPER 2 Q2/Q3: ISOMETRIC DRAWING
🔒
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