Cameroon Baccalauréat Série C common mistakes
Cameroon Baccalauréat Série C · Understand the traps and how to avoid them.
In Mathématiques, the candidate writes the final answer of a calculus or algebra problem without stating the domain of validity (e.g. gives x = 2 as a solution of an equation with a denominator or a logarithm without excluding values that annul the denominator or make the argument non-positive), or solves an inequality but returns a set of solutions that ignores the sign study.
Baccalauréat C papers are marked with a detailed barème: the reasoning and the conditions of existence carry points, and candidates who trained only on final answers (typical of rote revision of past papers) skip the preliminary conditions. Under time pressure they jump straight to the computation.
What to do instead
Adopt a fixed written routine for every equation/inequality: first line = conditions of existence (denominator ≠ 0, argument of ln > 0, radicand ≥ 0), then equivalence, then conclusion written as a set (S = ...). Practise by redoing 10 exercises where you write ONLY the conditions-of-existence line and the conclusion, to automatise it.
In Mathématiques, the candidate uses a theorem or formula outside its hypotheses - e.g. applies the intermediate value theorem or bijection argument without verifying continuity and strict monotonicity on the interval, or differentiates a function at a point without checking derivability there (absolute value, square root at 0).
The C programme emphasises rigorous analysis, but revision guides often present the theorem as a recipe ('compute f(a), f(b), conclude there is a root'). Students memorise the conclusion, not the hypotheses, and the examiner's first question is precisely the verification.
What to do instead
For each theorem in the analysis chapter (IVT, bijection, Rolle, mean value, FTC), write a one-page card with: hypotheses, conclusion, and one counter-example when a hypothesis fails. In exercises, force yourself to write the hypothesis check as an explicit sentence ('f is continuous on [a,b] as a polynomial, and strictly increasing because f'(x) > 0 on ...'), which is exactly what earns the points.
In Physique, the candidate applies a formula (e.g. v = √(2gh), lens formula, or electrical power relation) without checking units and without a dimensional or order-of-magnitude check, and reports a numerical result with too many digits or the wrong unit (cm instead of m, g instead of kg).
Physics problems in série C mix mechanics, electricity and optics; candidates under exam stress copy the numerical values into the calculator without converting to SI, and many never acquired the habit of a sanity check because school exercises often give already-SI data.
What to do instead
Impose a three-step protocol on every numerical question: (1) rewrite the data in SI units in a small table, (2) do the literal calculation first and only then substitute, (3) check the unit of the literal expression and the order of magnitude before writing the result with a sensible number of significant figures. Train on 15 mixed exercises where the data are deliberately given in g, cm, ms, mA.
In Physique and Chimie, the candidate draws a free-body diagram or a schematic circuit/titration setup that is incomplete or inconsistent with the equations written afterwards (missing reaction forces, forgetting friction direction, omitting the burette or the equivalence markers), so the reasoning and the figure contradict each other.
Diagrams are often treated as decoration rather than as the tool that generates the equations. Candidates draw quickly at the start and then solve from memory of the formula, so the figure is never used or corrected.
What to do instead
Make the diagram the first scored step: label every force with its symbol and point of application, choose and mark the axes, then project the forces on the axes in the same order as the diagram. For chemistry, always draw the full setup with the equivalence volume marked on the axis. Practise by grading your own diagrams against the barème before solving.
In Chimie, the candidate confuses the qualitative and quantitative levels: writes a balanced equation but then uses concentrations instead of amounts of substance in the stoichiometric table, or forgets that the limiting reactant determines the advance, and reports a pH or a yield computed from the wrong quantity.
The chapter on acid–base reactions and dosage requires the tableau d'avancement, which is taught late and often memorised as a layout rather than understood as conservation of matter. Students mix up c, n and V, especially when the volume changes on dilution.
What to do instead
For every stoichiometry problem, draw the tableau d'avancement with columns for each species and rows for initial, intermediate and final states, and fill it with amounts in moles (convert with n = cV or n = m/M). Add a final check: mass/matter balance and identification of the limiting reactant. Do ten dilution and ten dosage exercises with this template only.
In Sciences de la Vie et de la Terre, the candidate answers a document-based question by paraphrasing the document ('the document shows that...') instead of extracting the information, relating it to the course knowledge, and formulating a conclusion that answers the question asked.
SVT questions at Bac level are graded on the exploitation of documents (mise en relation), but many candidates, especially in série C where biology is not the specialty, revise by reading the textbook and never practise the written argument. They mistake description for explanation.
What to do instead
Use the standard three-part answer for every document question: (1) 'I extract from the document: ...' with precise values/observations, (2) 'I know from the course: ...' with the relevant mechanism, (3) 'I conclude: ...' answering the question. Practise on five past document questions, writing only these three labelled paragraphs, and time yourself.
In Français, the candidate produces a dissertation or a commentaire composé that is a chain of generalities and paraphrases the text, with no explicit problématique, no announced plan, and paragraphs that do not follow the three-part structure (thèse, antithèse, synthèse or the axes of the commentary).
French is compulsory for all série C candidates but is often under-prepared because of the heavy maths/science workload; students rely on their oral fluency and improvise, unaware that the barème rewards structure, explicit transitions and reference to the text.
What to do instead
Memorise and rehearse two templates: for the dissertation, an introduction in four moves (amorce, problématique, annonce du plan) and a body with explicit connecteurs; for the commentaire, axes derived from the text's own oppositions. Write one full introduction and one transition per week and have them corrected, since these are the highest-yield, most mechanical points.
In Anglais (LV1) and the seconde langue, the candidate answers the comprehension questions by copying whole sentences from the text, and in the expression task writes short, error-ridden sentences with no linking words and no respect for the required word count or register.
Candidates transfer the habit of 'copying the passage' from lower classes, and because the language paper is seen as a minor coefficient, they do no timed writing practice. Grammar errors (tense, agreement, articles) then dominate the mark.
What to do instead
For comprehension, always reformulate in your own words and answer the exact question (who/what/why). For expression, prepare a bank of connectors and a 120-word skeleton (introduction, two arguments with examples, conclusion), and write one timed 150-word text per week on a past subject, then correct it against a checklist of the five grammar points you personally get wrong.
In Philosophie, the candidate recites a memorised author or a prepared essay regardless of the question, and produces a 'catalogue of doctrines' with no problematisation and no argumentative link to the subject.
Philosophy has a small coefficient in série C and is revised by memorising résumés of authors; candidates fear the blank page and reproduce a course rather than think about the specific subject, which the examiner immediately penalises as hors-sujet.
What to do instead
Before writing, spend 10 minutes on a brouillon: reformulate the subject, identify the implicit opposition (e.g. liberté/nécessité), formulate a problématique in one sentence and a plan in three parts. Use authors only as arguments inside your own reasoning. Train by writing three problématiques and plans for past subjects without writing the full essay, then compare with the expected structure.
In Histoire-Géographie and Éducation à la citoyenneté, the candidate answers with undated, unlocated generalities (no dates, no maps, no precise examples) and ignores the 'document' part of the subject, or in the civics/geography section confuses scales and forgets to use the map or the statistics provided.
These subjects are perceived as 'easy' and revised by reading, not by memorising the minimal factual framework (dates, key figures, map locations). Candidates also skip the document because they think it is optional, losing the points attached to it.
What to do instead
Build a one-page 'minimum vital' per chapter: 10 dates, 10 key figures, 5 located places, 3 precise examples. In the exam, always treat the document first (nature, source, date, message) and use it explicitly in the answer. Rehearse the map by drawing the outline of Cameroon and its regions from memory weekly.
In Éducation physique et sportive and Éducation à la citoyenneté, the candidate neglects the written/theoretical component (rules, health, citizenship, first aid) and arrives at practical tests without the required medical certificate or without knowing the evaluation criteria, so a strong practical performance is not converted into marks.
EPS is treated as a purely physical matter and the administrative and theoretical parts are seen as formalities; in citizenship education, students underestimate questions on institutions and rights because they seem obvious.
What to do instead
Read the official evaluation grid for EPS and the list of required documents at the start of the year; prepare a short written revision sheet on the rules of the practised activities, first aid and citizenship institutions. Schedule the medical certificate and sports kit well before the session, and rehearse the practical tests under timed conditions.