Most students study new material constantly but NEVER review what they've already learned.
Result? They forget 70% of it by exam time and have to re-learn everything.
Try this instead:
Every week, (for example, every Sunday,) spend 10 minutes doing a "brain dump" of last week's topics.
Write down everything you remember WITHOUT looking at notes.
Whatever you forgot = your review target for this week.
Try it out :)