How to Score 15 or 18 in Bac Maths in Algeria
To score 15+ in Bac maths in Algeria: know the two-subject exam format, master your stream's key chapters, drill timed past papers and avoid the classic mistakes.
Scoring 15 or more in Bac maths in Algeria is not reserved for gifted students: it comes from a method. You need to know the exam format inside out (two subjects to choose from, each usually made of 3 to 4 exercises marked out of 20), master the chapters that come up every year in your stream, work through dozens of past papers under real conditions and write complete, justified answers. To reach 18 and above, add flawless presentation and time management with no careless calculation errors. Here is the plan, step by step.
What does the Bac maths exam look like?
For each stream, ONEC sets two subjects (sujets): you choose just one and answer it in full. Each subject contains several independent exercises; the last one is often the longest and highest-scoring, and frequently involves studying a function. Exam length depends on your stream: it is longer in Mathematics and Technical mathematics than in Experimental sciences, so check the duration on your exam notice.
Spend the first 10 minutes reading both subjects in full before choosing. Pick the one where you are sure to collect the most points, not the one whose first exercise looks easiest.
Which chapters should you prioritise for your stream?
Some chapters appear almost every year. The list below reflects common themes in past papers; since the syllabus can change, always rely on the official programme and your teacher's guidance:
- Experimental sciences: functions (exponential and logarithm), often the heaviest exercise, sequences, probability, complex numbers, 3D geometry and integration.
- Mathematics and Technical mathematics: the same chapters in more depth, plus complex numbers and transformations, 3D geometry and, in the Mathematics stream, number theory (arithmétique).
- Management and economics: sequences and their economic applications, functions, statistics (linear regression) and probability.
- Literature and philosophy, Foreign languages: sequences, simple functions and numerical calculation, with a small coefficient that can still lift your average.
Start with functions and sequences: they appear in almost every stream and carry a large share of the marks. To see how much maths weighs in your overall result, read our guide to how the Bac average and coefficients work.
How should you use past papers (sujets corrigés)?
Past papers with model answers are your most powerful tool, as long as you work through them actively instead of just reading the solutions.
- 1Start by chapter: gather every sequences exercise from the last ten years and solve them back to back to spot recurring patterns.
- 2Solve without looking at the answers, then compare with the model solution and the marking scheme.
- 3Log every mistake in an error notebook with its cause: a gap in the lesson, a calculation slip or a misread question.
- 4From March onwards, sit one complete paper a week, timed and under exam conditions.
- 5In the final weeks, redo the exercises you got wrong rather than only tackling new papers.
What revision plan works from October to June?
A top maths grade is built across the whole year, not in the final few weeks. Here is a suggested breakdown to adapt to your school's pace, whether you study in Algiers, Oran or an inland wilaya:
- October to December: understand each lesson as it comes, do the textbook exercises and fix old gaps in algebra and reference functions.
- January to March: solve past-paper exercises by chapter as soon as each lesson is finished, keeping a tidy error notebook.
- March to May: one full paper a week, timed, then marked against the scheme with an analysis of every lost point.
- June: review your error notebook and the essential rules (limits, derivatives, antiderivatives, probability laws), and sleep well before the exam.
In a science stream, plan for 5 to 8 hours of maths a week outside class, in short and regular sessions. Consistency matters more than occasional marathon sessions, because maths is a skill built through repetition.
How should you manage your time on exam day?
Time management is often the difference between 14 and 17. Split your time roughly according to the points for each exercise, and start with the one you know best to build confidence. If you are stuck on a question for more than 10 minutes, leave space and move on, then come back later. The result of one question is often given in the wording of the next, so you can use it even if you could not prove it. Keep the last 15 minutes for rereading and checking calculations.
Which mistakes cost the most marks?
- Writing results without justification: examiners mark the steps and reasoning, not just the final answer.
- Forgetting the domain of definition and the conditions on the logarithm before calculating.
- Sign errors when studying variations and building the variation table.
- Forgetting the area unit or the graphical meaning of an integral.
- In probability: mixing up drawing with and without replacement, or probabilities that do not add up to 1.
- A rough sketch of the curve: use a ruler and respect the scale, key points and asymptotes.
To reach 18 and above, your script should read like a model answer: numbered questions, clear linking sentences and boxed results. It makes the examiner's job easier and limits lost marks.
When does a private maths teacher help?
Private lessons help when you carry old gaps (algebra or functions from 2nd year secondary), when your grades stall despite steady work, or when you need someone to mark full papers and teach you how to write solutions. A good teacher does more than repeat the lesson: they diagnose your mistakes and give you targeted exercises. You can search for a maths teacher by wilaya on Tadreasy, including online lessons, compare accounts and get in touch directly. To organise your revision more broadly, read our effective study techniques.
Frequently asked questions
Can I score 15 in maths if I was weak in 2nd year? Yes, if you start early and fix the basics first (algebra, equations, reference functions) before moving on to Bac papers.
How many past papers should I do? There is no official number, but covering at least the last ten years of papers for your stream gives you a clear picture of the recurring questions.
Do I have to answer the exercises in order? No. You can start with any exercise, as long as you number your answers clearly and answer only one subject.
Group lessons or one-to-one? Group lessons suit general revision; one-to-one lessons work better for fixing specific gaps or aiming for a very high grade.
