Be mindful and present.
What the heck does that mean? Well, basically it means that when you study, make sure that you are really focused on studying and that you are thinking about what you are thinking about. Some things in life are checklist. Grocery shopping for instance. You put each item on the list in your cart, pay and go home. Checklist.
Studying is not a checklist activity. It does not help you much unless you are really paying attention to what you are studying. Sit down and make a plan for studying and then make sure you are asking yourself questions as you study, and that you are thinking about what you are reading and reviewing.
Invest your attention and your presence in studying. You get back what you put in!