To do well on tests you must first learn the material and then review it before the test.
These are techniques to better understand your material:

Learning and Overlearning

• Review your notes soon after class;

• Review notes briefly before the next class;

• Schedule some time each week for a longer review.

Reviewing

• Organize your notes, texts, and assignments;

• Estimate the hours you'll need to review materials;

• Draw up a schedule that blocks units of time and material;

• Test yourself on the material;

• Finish your studying the day before the exam.