Make yourself a time table to make sure that you are revising each of your subjects. Having a hard paper copy will make sure you revise. Stick it on your wall or take a picture and save it as your lock screen.
In order to get the most out of your revision, I advise creating a schedule, so you have a visual timetable of your day, & therefore know the times where you're able to sit down & study. This allows you to eliminate periods of time where you're wasting away what could be precious & beneficial time for studying. Make sure when creating a schedule or timetable to factor in any extra-curricular things you have on, & hobbie