Bac D Bénin common mistakes
Bac D Bénin · Understand the traps and how to avoid them.
In mathematics, the candidate computes a limit or a derivative and stops at the raw expression, omitting the concluding sentence that states the result and its interpretation (e.g. the asymptote or the sign of f').
Past-paper habits from collège reward getting the number; at the baccalauréat the marking grid allocates points to justification and conclusion, so the candidate loses marks despite correct algebra.
What to do instead
Before writing, draft a two-line skeleton per question: the calculation, then a sentence 'donc ...'. Train on three corrected exercises per week and check the official marking scale to see where conclusion points sit.
In mathematics, the candidate uses a theorem (Théorème des valeurs intermédiaires, Rolle, or convergence of a sequence) without verifying its hypotheses: interval of definition, continuity, monotonicity, or initial condition.
Theorems are memorised as formulas rather than as conditional statements, and time pressure pushes candidates to skip the hypothesis check.
What to do instead
Rewrite each theorem on a revision card as 'If [hypotheses] then [conclusion]'. In every exercise, force yourself to write the three hypothesis lines before applying it, even when they seem obvious.
In physics, the candidate substitutes numerical values into a formula before establishing the literal expression, then cannot check units or propagate uncertainty.
Secondary-school habits favour immediate number-crunching, and the candidate fears running out of time; unit analysis is rarely practised.
What to do instead
Impose a three-step routine on every exercise: literal expression, dimensional check, then numerical application with units carried throughout. Do five such drills per chapter until it is automatic.
In chemistry, the candidate confuses the quantities in an acid-base or redox problem (amount of substance versus concentration, or oxidant versus reductant) and writes an unbalanced equation.
Vocabulary is learned in lists rather than in context, and the candidate does not systematically balance atoms, charge, and electrons before calculating.
What to do instead
Adopt a fixed balancing checklist (atoms, charge, electrons) and annotate each species with its role (ox/red) directly on the draft. Practise ten half-equations per week and verify with the conservation of electrons.
In SVT, the candidate answers a document-based question by describing the graph ('la courbe monte puis descend') without extracting a biological interpretation or linking it to a mechanism.
Reading graphs is taught as a descriptive skill, and the candidate does not distinguish observation from interpretation, which the marking grid separates.
What to do instead
Use the three-part structure 'je observe / je sais / j'interprète' on every document. Practise by covering the interpretation column of corrected exercises and writing it yourself before comparing.
In SVT, the candidate uses vague causal wording ('à cause de', 'cela provoque') to describe a relationship between two variables without establishing a rigorous causal or correlational link.
Everyday French connectors are imported into scientific writing, and the candidate has not been trained to distinguish correlation from causation or to identify the experimental variable.
What to do instead
Keep a personal list of precise connectors ('est corrélé à', 'entraîne', 'est nécessaire à') and apply them in written exercises. For each document, explicitly name the variable manipulated and the variable measured.
In French, the candidate produces a dissertation or commentary that paraphrases the text or lists ideas without a problem statement (problématique) and without a announced plan.
The candidate has memorised content but not the rhetorical architecture; the introduction is written last under time pressure and becomes generic.
What to do instead
Write the problématique and the plan outline on a separate sheet before drafting any paragraph, and time-box the introduction to fifteen minutes. Rehearse introductions alone on ten past subjects.
In philosophy, the candidate builds a dissertation as a catalogue of authors' doctrines rather than as an argumentative progression answering the question.
Revision is organised by author rather than by notion, so the candidate reaches for a ready-made doctrine instead of constructing a reasoning.
What to do instead
For each notion, prepare a problem-centred file with two or three tensions and the authors who illuminate them. Practise writing a single fully argued part rather than a whole dissertation, focusing on transitions.
In the foreign language, the candidate writes a structured essay or letter using memorised chunks that do not answer the prompt's specific task, and mixes register or tense inconsistently.
Learning is driven by rote templates and vocabulary lists rather than by task types, and the candidate does not re-read for cohesion.
What to do instead
Practise the three or four exam task types separately (formal letter, opinion essay, account), each with a fixed functional-language bank. Reserve five minutes at the end to check tense consistency and register against the task instructions.
In history-geography, the candidate answers an essay question with a narrative of events and no spatial or chronological framework, omitting the map or the periodisation the question requires.
The candidate treats history as storytelling and geography as description, and has not internalised that the marking grid rewards organisation and use of evidence.
What to do instead
For each theme, memorise a minimal skeleton: three dated milestones for history, three scales or mapped examples for geography. In every practice essay, sketch the plan and place at least two precise examples with dates or locations before writing.