Taking breaks can actually improve mental focus and allow you to study longer. Quick breaks (5-10 minutes) about every hour, or however long you can maintain focus, are a good rule of thumb. Longer breaks (30 minutes) are recommended every 2-4 hours.
Boley provides several study break ideas through the Digital Whiteboard and When You Need A Break. New for exams is this 5 Minute Study Break guide (look for the drop down menu) that focuses on quick breaks that give you time to refresh your mind and then get back to studying. Ideas include:
These quick breaks will help to refresh your mind and get you ready to tackle your next subject.