BGCSE common mistakes
BGCSE · Understand the traps and how to avoid them.
In multi-step algebra and geometry questions, writes only the final answer or jumps between lines without showing the formula substitution, operation, or geometric reason.
Candidates practise matching final answers and assume only the value is marked; under time pressure they treat working as optional and skip method steps.
What to do instead
Train a 'one line per operation' habit: copy the formula, substitute values visibly, state the operation or reason, and box the answer with units. In revision, mark own work against method-mark descriptors, not just the answer key.
In ratio, scale-drawing, map and unit-conversion items, substitutes numbers with different units (cm with m, g with kg) or uses direct proportion where the relationship is inverse.
Numbers are treated as unitless and candidates match a remembered formula without checking what the quantities mean or how they change together.
What to do instead
Require a pre-calculation quantity table listing each value with its unit, then convert to one system before substituting. For proportion, test a simple case: if one quantity doubles, decide whether the other should double or halve, and state the reason.
In comprehension, copies a full sentence from the passage even when the question asks 'in your own words' or asks for an inference, so the response does not answer the command word.
Lifting feels safe and is quicker than composing an answer; limited vocabulary makes paraphrase feel risky, so candidates avoid rewording.
What to do instead
Teach a two-step routine: underline the command word and the exact passage evidence, then write a paraphrase with the quoted words removed. Use sentence stems such as 'The writer implies that... because...' and peer-check for copied strings.
In directed writing (letter, report, speech), omits expected format features such as addresses, salutation, headings or sign-off, or shifts register mid-text into slang and informal chat.
Format is learned as a list rather than as a purpose-driven convention; candidates focus on content, run out of time to plan, and lose sight of audience and register.
What to do instead
Memorize a small set of format skeletons and spend two minutes planning audience, purpose and register. Draft with a checklist, then do a final 'register scan' replacing informal words with formal equivalents.
In practical and investigation questions, states a conclusion that is not supported by the data, or describes what happened without identifying the independent, dependent and controlled variables.
Practical work is often followed as a recipe, so candidates do not connect evidence to claim; they confuse observation with inference and never list variables explicitly.
What to do instead
Use claim-evidence-reasoning frames: make a claim, quote values or trends as evidence, and explain with a science idea. Before answering, list the independent, dependent and controlled variables; practise conclusions that include a data reference and a limitation.
In chemistry equations, writes formulae with incorrect valency or unbalanced atoms, and omits state symbols or conditions even when the question requires them.
Balancing is memorized as a trick without the particle model; ion charges are not secure, so formulae are guessed and equations are never checked atom by atom.
What to do instead
Drill common ion charges and use a swap-and-drop method with a check. Balance by drawing particle boxes or an atom tally, then apply a four-point checklist: formula, balance, states, conditions.
In history essays, writes a chronological narrative of events rather than answering the set focus on causes, consequences, change or continuity, often ending with a story but no judgement.
Revision is dominated by timeline memorization; command words are not unpacked, so candidates reproduce everything they know instead of selecting evidence for the question.
What to do instead
Analyse the command word and plan by categories such as political, economic and social. Write PEEL paragraphs with a point tied to the question, evidence, explanation and link; convert timelines into cause-event-consequence chains.
In geography map work, misreads grid references, measures straight-line distance without converting scale, and describes distribution only as 'scattered' without direction, density or pattern.
Map skills are practised rarely; scale is treated as a number rather than a ratio, and candidates lack vocabulary for describing spatial patterns.
What to do instead
Use 'along the corridor, up the stairs' for grid references; measure and convert with the scale before answering. Describe distributions using compass direction, density, and terms such as linear, clustered or dispersed, and note anomalies.
In Setswana writing, mixes subject concords across noun classes and writes incorrect word divisions, especially in contractions and locatives.
Oral fluency masks written grammar; candidates write as they speak and rarely proofread for concord or standard written word division.
What to do instead
Use a noun-class concord table, underline subject and verb before writing, and practise ten sentence transformations. For word division, read aloud, apply standard written forms, and peer-edit with a concord-and-spelling checklist.
In practical and vocational tasks, starts work without a risk assessment or tool check, and skips safety steps such as PPE, isolation or waste disposal to finish the product faster.
Candidates assume marks are only for the final product; safety is seen as talk rather than assessed process, and overconfidence leads to shortcutting procedure.
What to do instead
Make a signed pre-task checklist covering hazards, PPE, tool suitability and waste. Assess the process with a sequence card and stop/reset if a safety step is missed; run timed dry runs so safe procedure becomes automatic.