Don't mistake recognition for an ability to recall the information. Rereading or summarizing your textbook and notes may help for short-term memorizing but not for transferring to long-term memory. Continue testing yourself until you can fully explain or answer the question.
Space your study sessions out over a number of days.
Focus on and identify the information that you don't know well, not what you feel comfortable with already.
Practice your test-taking skills by writing complete answers under exam conditions.