Hey, Depends on what you are revising for BUT if you can fit in 3 or 4 hours it will help you in the long run What you should be doing? 1. Reading over notes 2. Doing PPQ 3. Making revision notes/flashcards using bright colours/highlighters etc if it works for you 4. making a to do list of what you want to accomplish and tracking your progress 5. Making a note of things you don't understand