A revision timetable fails when it assumes every day will go perfectly. A good one is simple, realistic and easy to adjust.
1. Start with fixed points
Write down the date of each exam. Work backwards and mark days that are already taken: school, family events, prayer and rest, sport. What remains is your real revision time.
2. List the topics
Take the syllabus for each subject and list its topics. Rate each topic as strong, medium or weak. Spend more time on the weak ones, but do not ignore strong topics: they give quick marks.
3. Break work into small blocks
Use blocks of 30 to 45 minutes with a short break. Name each block by its task, such as "Organic chemistry: write a summary, then do five questions". "Study chemistry" is too vague to start.
4. Mix subjects and methods
Alternate subjects across the day. Use different methods: read, write from memory, solve questions, mark your own work against the mark scheme.
5. Put past papers in early
Do not leave practice papers for the last week. Schedule one early to find gaps, then use the results to adjust the plan.
6. Leave slack
Leave one free session each week and one free day before each exam. Missed blocks move there instead of destroying the plan.
7. Review every week
On the same day each week, check what was done, what was missed and what to change. A plan you update is better than a perfect plan you abandon.
If you want help turning a syllabus into a plan, a tutor can build one with you and check progress each week.