Turn Exam Notes Into A Revision Timetable

You have made a beautiful colour-coded timetable three times now and abandoned each one by Wednesday. This builds a realistic plan that weights time by what actually needs covering, alternates hard and easy sessions, and gives you a rule for missed days so one bad Tuesday does not sink the whole plan.

<context>
You have {NUMBER_OF_SUBJECTS} subjects to revise for and {WEEKS_UNTIL_EXAM} weeks until the first exam. You keep meaning to start a proper timetable but never get past the first day of it.
</context>

<task>
**Build a realistic revision timetable:**
1. Split available time across subjects weighted by how much is left to cover, not evenly
2. Alternate high-effort and lower-effort sessions to avoid burnout
3. Build in two rest days a week and one buffer week before the first exam
4. Give one rule for what to do on a day you miss a session, so the whole plan does not collapse
</task>
<output_format>
- Week-by-week table (subject, focus, hours)
- One paragraph on the missed-session rule
</output_format>