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I sat S6 in Rwanda. I made every mistake. Here is the year-long plan I wish someone had given me — broken down by combination (MCB, MPC, MEG, BCG and others), with the specific habits that move scores.
S6 is the year that decides where you go to university and, for many Rwandan students, what you do with the next decade of your life. The aggregate from your three principal subjects, plus General Studies and Communication Skills, determines whether you get into the University of Rwanda's competitive faculties (medicine, engineering, computer science), whether you qualify for a government scholarship, whether you get a private-sector internship that becomes a job. It's heavy. It's heavier than S3 and far heavier than P6.
I sat S6 in MCB. I made nearly every mistake an S6 student can make: started revising too late, spent too much time on subjects I already liked, ignored my mistake log, slept four hours a night the week before. I came out fine. But I'd have come out a lot better if I'd done it right.
This is the post I wish someone had handed me at the start of S5.
The single most important early decision is how to allocate your time. The wrong way is “a bit of each subject, equal time.” The right way is to weight by what your combination demands.
For most combinations the time split that works is roughly:
Within the 70%, your hardest subject gets the most time, not your favourite. If you're MCB and you love biology but struggle with math, math gets more hours, not biology. The exam doesn't care which one you enjoy.
You're still learning new content. The temptation is to start past papers immediately. Don't. Past papers without foundational understanding waste both — you fail the questions and you don't know why.
Instead, do one specific thing per week per subject: at the end of every week, write a one-page summary of what you covered. In your own words. With a worked example. This is the single highest-leverage habit in S5 and the first half of S6. By the end of term 1 you have a stack of one-pagers — your own custom revision notes — that no textbook can replace.
Now past papers. One full paper per principal subject per week. Mark them strictly. Build a mistake log — every error you make, write it down with the correct method.
The mistake log is the secret weapon of S6 students who jump from average to top-10%. Almost no one keeps one. The kids who do reach the exam already knowing what they tend to get wrong, which means they double-check those exact things on the day.
One thing I'll repeat from earlier posts because it matters here too: re-read your mistake log every weekend. Twenty minutes. The whole thing. Even the entries from two months ago.
Two full mock exams per week, simulating real conditions. By month 8 you should be scoring within 5% of your target. If you're not, the issue is almost always one of three things:
Math is the linchpin. It's the one subject where past papers beat textbooks by the widest margin. The S6 math exam has been structured almost identically for the last decade — there's a Section A (short questions, equally weighted, no choice) and a Section B (longer questions, you pick a subset). The proportion of marks from each topic is remarkably stable year over year:
Calculus alone is a third of your math grade. If you can do calculus comfortably, you've secured a B at minimum. The hardest jump within calculus is from differentiation to integration — most students try to skip ahead and pay for it. Spend an extra week on integration techniques (substitution, by parts, partial fractions) before moving on.
Two things win you marks in physics: units and significant figures. Genuinely. I've marked S6 physics papers — students lose enough marks on missing units to drop a full grade. Memorise the formula sheet, but more importantly memorise the units of every constant. Write units in every line of working, even when you don't need to.
The other thing physics rewards: diagrams. Every mechanics question deserves a force diagram. Every circuit question deserves a circuit diagram. Examiners give marks for the diagram itself, separately from the calculation.
Organic chemistry is the part most S6 students underestimate. Reaction mechanisms come up every year and are heavily weighted. Make flashcards — physical paper flashcards — with the mechanism on one side and the result on the other. Drill them in 10-minute sessions every day for a month.
Inorganic chemistry rewards memorisation of reactions and colour changes. Make a one-page table of the common reactions: what reagent + what produces what + what colour. Memorise it.
Physical chemistry (thermodynamics, kinetics, equilibria) overlaps heavily with math. If your math is solid, your physical chemistry will be solid too.
Biology is the most detail-heavy A-level subject in Rwanda. The trap is trying to memorise it all in one go in term 3. It doesn't work. Memory consolidation requires spacing — review each topic 1 day, 3 days, 1 week, and 2 weeks after first study.
The high-yield topics every year:
Don't skip the diagrams. Heart, nephron, neuron, plant cell, mitochondrion — these come up every single year. Practice drawing them with full labels in under 90 seconds.
The S6 English paper rewards structure. Every essay should have an introduction stating your position, three body paragraphs each with a clear topic sentence, and a conclusion. The students who get top marks all use this structure — not because they're unimaginative, but because the rubric explicitly rewards it.
Read past student answers that scored 80+. Notice the structure. The vocabulary isn't flashy. The sentences are clear. They make their argument and back it with examples.
Same as S3, scaled up. The literature questions are predictable — read the prescribed texts properly, summarise them, know the themes. The grammar questions reward precision in imyandikire (spelling and orthography). One week of focused drilling on imyandikire is worth 5+ marks.
These two subjects are often treated as afterthoughts. They shouldn't be. Together they account for ~20% of your aggregate. The questions are predictable — current affairs, history, geography, ethics, communication theory. The students who actually open the syllabus and prepare typically score 75–85%. The students who don't typically score 50–60%. That gap matters for your aggregate.
This is the single specific habit I'd emphasise above all others.
Get a notebook. After every past paper or practice session, write down every question you got wrong, with the correct method (not just the answer). Date each entry.
Every Sunday, re-read the entire log. The early entries will feel obvious. That's good — they should. The recent entries will still feel hard. That's the work.
By month 8 of S6, your mistake log should be 50–80 pages thick. The kids who actually keep one almost always outperform their predicted grade. The kids who don't typically underperform.
S6 feels enormous. It is. But every Rwandan student who passed it followed roughly this rhythm — practice, mistake log, sleep — with their own subject mix. Start today, do the work, trust the process. The score takes care of itself.
If you want past papers organised by year and combination, free, with auto-marking, they're on Ganzaa's past papers library. If you want help with one specific subject, the practice mode covers MCB, MPC, MEG, BCG and the major science combinations.
You'll be fine. Mwitwararike.
I've tested the major learning apps available to Rwandan students. Here is the honest, opinionated review — what works, what doesn't, and what to skip entirely. With my biases declared up front.
S3 is the second turning point in a Rwandan student's life. Past papers are the highest-leverage tool you have — and most kids use them completely wrong. Here is how to do it right.
Ganzaa is Rwanda's online learning platform — free for individual students, with REB-aligned practice and past papers. Schools get the first term free.