Start with a revision system, not a perfect timetable
A timetable is useful only if it changes what you do. Start each week by choosing the topics that matter most, then plan short sessions that include recall, practice and review. After each session, write down what you could do without notes, which questions caught you out and what you will revisit next. This keeps revision honest: the question is not “Did I look at the topic?” but “Can I use it when the notes are closed?”
A simple weekly loop is: 1) choose topics, 2) test yourself, 3) practise questions, 4) mark or check your work, 5) move weak points into the next plan. Keep the loop realistic enough that you can repeat it when schoolwork, jobs, sport, family and rest are also happening.