You will need to have the following information ready:
The dates of any exams or tests
Revision topic lists for all of the subjects you need to revise. This might be a list of topics given to your by your teacher, a list of textbook chapters, or the relevant section of the exam board specification.
An understanding of other commitments you need to make time for. For example, college classes, clubs, family commitments, social commitments, part time work, etc.
Now choose a revision plan template that will work for you. There are some suggestions below, but you may want to create your own.
Decide how long you will revise for between breaks. Write this onto your plan.
Show on your plan the days and times you will be revising - block out time for rest and other commitments.
Now note down on your plan which subjects and units you will be revising each day.
Try to avoid other distractions during the time you have set aside for revision. To do this, you will need to think carefully about where you are revising. Consider leaving your phone in another room if possible.
If you find it difficult to return to revision after a break, set a timer for when it's time to start work again, and give yourself something to look forward to in the next break. This might be playing a game, watching a tv episode or going outside for some fresh air, for example.
Vary your revision methods to make your revision more interesting and keep you focused.
If you don't manage to stick to your plan one day, continue the next day as planned. Try not to let one difficult day affect a whole week.
Review your timetable each week, and make any changes that are necessary to make it work.