Cameroon CAP Vocational Trades common mistakes
Cameroon CAP Vocational Trades · Understand the traps and how to avoid them.
When a calculation asks for a cutting length, the candidate first computes the finished/dimension length and writes it down without adding the kerf/saw allowance or the machining allowance for facing and jointing.
Candidates memorise the finished dimension from the drawing and treat the material as if it is cut exactly to size. They have never internalised that the saw removes material and that a planed or faced surface loses thickness, so the allowance step is skipped entirely.
What to do instead
Adopt a fixed written routine for every length calculation: (1) read the finished dimension from the drawing, (2) add the machining allowance for each faced end, (3) add the kerf for each cut, (4) write the total with its unit. Practise ten exercises where the finished dimension is given and only the stock length must be found, and check the answer against the stock actually issued in the workshop.
The candidate reads a technical drawing correctly but transfers a dimension to the workpiece from the wrong reference face, or measures from the end of the stock instead of the datum edge indicated on the drawing.
In the workshop candidates often measure from whatever end is nearest or already square, because that is quicker. On the exam drawing the dimensions are chained from a specific datum, and candidates do not consciously identify the datum before marking out.
What to do instead
Before any marking out, state aloud and write on the drawing which face or edge is the datum, and mark it with a pencil cross. Then chain every dimension from that single face. On the exam, annotate the drawing with the datum symbol before answering any dimension-transfer question, and reject answers that measure from a non-datum end.
The candidate names a tool or material in general terms ('a saw', 'a screw', 'glue', 'a safety shoe') instead of giving the specific type required by the task, such as a tenon saw, a countersunk head screw, a polyurethane adhesive, or a safety boot with a steel toe cap.
Candidates revise from memory of the workshop rather than from a tool/material list, so they recall the category and not the designation. Exam questions in this domain are deliberately specific because the correct tool choice is the point being tested.
What to do instead
Build a one-page inventory for your trade: for each operation, list the exact tool name, its size designation, and the material grade or standard it serves. Recite the inventory weekly and, in the workshop, say the full name of every tool you pick up rather than 'the saw' or 'the glue'.
The candidate lists safety measures as slogans ('be careful', 'respect safety', 'wear PPE') without naming the specific hazard, the specific protective equipment, and the specific control measure for the operation described in the question.
Safety is often taught as general advice and revised as a list of phrases. Candidates do not practise mapping a described hazard (dust, flying particles, electric shock, fall from height, chemical splash) to its control, so they produce generic answers that earn no marks.
What to do instead
For each major operation in your trade, write a three-column table: hazard, immediate effect on the body, and control (engineering control first, then PPE). Answer practice questions by naming the hazard explicitly, then the control, then the PPE, in that order, so the examiner can see the chain of reasoning.
The candidate performs the arithmetic of a costing question correctly but omits one or more cost components: labour time, overheads, transport, consumables, depreciation of tools, or the profit margin, and then quotes the bare material cost as the price.
Candidates think of 'cost' as what they paid for the raw material, because that is the only cost they personally handle in the workshop. Overheads and labour are invisible in day-to-day work and are forgotten under exam pressure.
What to do instead
Use a fixed costing template every time: materials + consumables + labour hours × hourly rate + overhead share + transport + depreciation + margin = selling price. Write the template at the top of your answer sheet before starting the calculation, and tick each line as you fill it. Never present a price without showing the margin line separately.
The candidate answers a 'state the steps' or 'describe the procedure' question with a single sentence or an unordered list, instead of a numbered sequence in the correct order with the key check at each stage.
Candidates know the job but have never written it down, so they compress the procedure. Ordering matters because a step taken out of sequence (for example finishing before assembly, or testing before isolation) is a real fault on the job and a lost mark on the paper.
What to do instead
For every standard job in your trade, write a numbered procedure card of six to ten steps, each beginning with a verb and each ending with the check that confirms the step is complete. Memorise the cards and answer procedure questions by reproducing the numbered sequence, adding the check phrase after each step.
The candidate leaves measurement answers without units, mixes millimetres and centimetres in the same calculation, or rounds an intermediate result and carries the rounded value forward into the final answer.
In the workshop, millimetres are the default and units are rarely spoken, so the habit of writing them disappears. Candidates also round early because it makes mental arithmetic easier, without realising the error accumulates.
What to do instead
Adopt two rules and apply them in every calculation: convert all quantities to the same unit and write that unit beside every number, and keep full precision until the final line, rounding only there. On the exam, underline the unit requested in the question before starting, and finish by checking that the answer's unit matches what was asked.
The candidate describes the fault symptom and the replacement part but not the diagnostic sequence: no isolation of the equipment, no test to confirm the fault, no check of the cause before replacing the component.
Candidates learn maintenance as 'if it does not work, change this part', which is how it is often done in a small workshop under time pressure. Exam questions test the reasoning behind the replacement, and the reasoning is what is missing.
What to do instead
Answer every fault-finding question with the sequence: make safe and isolate, confirm and describe the symptom, test to locate the faulty section, identify the cause, then repair or replace, then test and record. Practise on real or described faults and write the sequence out each time until it is automatic.
The candidate writes the professional communication or workplace conduct answer as a moral judgement ('he was wrong', 'she should be polite') rather than describing the specific action, the person addressed, the channel used, and the record kept.
Candidates treat these questions as general knowledge about good behaviour, so they answer with opinions. The marking scheme looks for observable professional actions: reporting to the supervisor, writing it in the log, informing the client in writing, following the chain of command.
What to do instead
Answer with concrete actions in the form 'who does what, to whom, how, and what is recorded'. For each scenario type (late delivery, defective work, unsafe instruction, customer complaint, conflict with a colleague), prepare a four-line answer naming the action, the person, the channel and the record. Avoid adjectives about character.
The candidate attempts the trade-specific theory question from workshop habit alone and ignores the underlying principle, so the answer describes what is done but not why it works, and cannot explain the consequence of doing it differently.
Apprentices are trained to reproduce gestures, and the theory lesson is treated as secondary to the practical. Exam questions in this domain ask for the reason: why a joint is stronger in one orientation, why a mixture ratio matters, why a tolerance is specified.
What to do instead
For each key operation in your trade, prepare a three-part note: what is done, the principle that makes it work, and what goes wrong if it is done incorrectly. Revise by explaining each operation aloud to a colleague without notes. In the exam, add the 'because' clause to every descriptive answer.