This process often exposes concepts that are still unclear or fuzzy. You must be cautious in using old exams to the exclusion of other study aids. The range of examples is limited so that studying and knowing the examples on one test does not insure that you will do well on a test that focuses on alternate concepts. Taking old tests can also be a time consuming process. However the combination of studying all the target material and then taking an old exam can be a very effective.
Many publishers also print study guides to accompany the textbook.
They can shortcut your task of summarizing the information after studying the text. Tells you what you Must use time limit to still don't understand. Commercial Study Publisher has done much Cannot substitute for task Guides of the work for you.