Why this site exists

Our aims

What this site offers, how to use it, and the seven aims behind it.

Introduction

About this work

Donat Sciences and Maths offers free practice in physics, chemistry, biology and mathematics for Rwandan secondary students, from Senior 1 to Senior 6. Physics and mathematics are ready. Physics was written unit by unit from the REB 2026–2027 student books, so everything you practise here matches what you learn in class. Chemistry and biology are being prepared in the same way.

Physics is learned by doing. That is why every part of this site asks you to think, answer and check: short quizzes give instant feedback with an explanation, practice books let you revise offline, and the worked-solution packs show how an examiner expects each problem to be set out, step by step, with units.

The questions are built to develop all levels of thinking, from remembering key facts to analysing data, judging solutions and designing experiments. For S3 and S6, national exam practice follows the NESA format, including Section B questions and Section C experiments with graph plotting.

Every answer has been checked, and the answer options are written so that they cannot be guessed from their length or wording: you only score by understanding the physics.

3,300 quiz questionsPart A for every key idea and Part B with harder, exam-level questions, each with an explanation.

6 practice books50 new questions per unit that complete the quizzes, with answers, common mistakes and misconceptions.

Worked solutionsStep-by-step solutions, key diagrams, common mistakes and marking schemes.

Exam readyNESA-style Section B and C practice and full mock exams for S3 and S6.

Thinking skillsQuestions in every unit that climb from Remember to Create (Bloom's taxonomy).

Works on any phoneFree, no account needed, light on mobile data.

Free for everyoneQuizzes and practice books are free, with no account and no password. Open them on any phone.

Choose your levelOpen the quiz for your class, S1 to S6.
Practise a unitAnswer the questions and read every explanation.
Go furtherUse the practice book: new questions on the same unit, with misconceptions and common mistakes.
Prepare for examsStudy the worked examples, then try exam-style questions.

Why this site exists

Our aims

Our missionTo give every secondary student in Rwanda a free, safe and useful place to learn science and mathematics on a phone, wherever they study and whatever their needs.

1. Turn phones into a place to learn

Many day-school students spend long hours on social media and the internet, with nobody to guide them. We want the same phone to become a tool for learning: a few minutes of practice every day, with instant feedback, instead of endless scrolling.

2. ICT in education for everyone

Learning with ICT should not be only for big schools or rich families. The site is free, needs no account, works on any smartphone and uses little mobile data. The practice books can also be printed for learners who have no phone.

3. No learner left behind

Students with special needs learn here too: bigger text and high contrast for low vision, read-aloud and screen readers for blind learners, written and visual content for deaf learners, and an easy-reading font for learners with dyslexia.

4. Parents as partners

Parents can follow what their children learn, even if they never studied physics. Open a quiz with your child, look at the score together, and encourage them to try again until they pass. A parent who asks "show me what you learned today" makes a big difference.

5. A fair chance at the national exam

Self-learners, private candidates and students repeating a year can prepare on their own. Every unit follows the REB curriculum, with NESA-style exam questions, mock exams and marking schemes to check their work.

6. Understand, do not memorise

Every answer comes with an explanation. Questions climb from remembering facts to analysing data, judging solutions and designing experiments, so students learn to think like scientists, not just repeat notes.

7. Support teachers and schools

Teachers can use the quizzes for homework, revision and class activities. Rural and urban schools get the same quality material, and teachers can point learners who need extra practice to it.