Reading is probably the worst form of studying you can do before an exam. It is a very passive thing, and unless you are taking notes, your mind isn't actually retaining anything. I would suggest doing reading before a class or a topic has been introduced, but not to prepare for an exam that's 2 days away.

I would suggest target-oriented studying. You professors usually post a list of "Objectives" or "Goals" for particular section you are studying. You must actively seek to attain those objectives and quiz yourself repeatedly. If you can't explain your hajurama the topic, then you haven't learned it well enough. This is a more fun way of studying too, because you will feel more accomplished with each objective completed.