Review.
After reading a section, try to recall the information contained in it.
Try answering the questions you made up for that section.
If you cannot recall enough, re-read portions you had trouble remembering.
The more time you spend studying, the more you tend to recall.
Even after the point where information can be perfectly recalled,
further study makes the material less likely to be forgotten entirely.
In other words, you can't overstudy.
However, how you organize and integrate new information is still more important than how much time you spend studying.
