Below is a google doc you can make a copy of. There is a timetable for term time, and also for school holidays set up.
Make a copy, and change the timings accordingly to suit you. Build in relaxation time, as it is important you look after your mental health too. Try not to work too late either. Sleep is important.
Once you have commited to the timetable, it is important you stick to it, so every subject you are studying for gets the attention it deserves. Be more specific than these examples - identify exactly how you will revise - and update it weekly so you plan ahead.
Speak to your teachers for assistance in designing your revision timetable.