It is vital that you use your time effectively and the best way to do this is to plan it out using a timetable. This is very similiar to the one you use everyday for your lessons but instead of showing maths period 1, it shows you when you are going to revise a subject or even better an aspect of that subject.
You need to factor in everything you do when planning a timetable, its important to try and get a good balance, if you go to the gym for 1 hour then add that to the timetable. Check out the video below.
Spacing means leaving gaps between study sessions, interleaving means inserting different topics into those gaps so that you don't spend too long revising one topic in isolation. This helps you to strengthen the links between ideas and adds to your long term memory. Check out this video to help.
It is a good idea to get a copy of the course content, specification or assessment statements. Having a copy of these will help you when revising to make sure that you cover all of the areas needed and don't miss an important section.
TOP TIP- it is a good idea to RAG rate your understanding as you work through the content this way you can identify the areas that you feel you are stronger on and the ones which you need to work more on to strengthen your memory.