Take multiple practice tests. Each section of the GMAT is timed; you have 75 minutes for both the math and verbal sections and half an hour for each of the essay sections. Taking multiple practice tests ahead of time will allow you to get comfortable with the time constraints of the GMAT. Practice tests also help you assess your areas of strengths and weaknesses. Practice tests can be found online or in test prep books. These tests are constructed of questions that are identical to ones that will appear on the actual test. If possible, try to take your tests online to simulate the computer adaptive format of the GMAT.
After a long study session, it can be hard to keep up your mental stamina. Instead of pushing your mind further, play brain games and mental puzzles. These mental puzzles work the same areas of the brain that are tested by the GMAT. Games such as crossword puzzles, chess, sudoku, and other games that foster skill and strategy are ideal. Do not substitute actual studying for these fun activities; use them only as a means of relief from mental exhaustion.
Focus on the subject areas where you have weaknesses. Take a practice test to gauge your skill level in the different topics tested on the GMAT. When studying, devote more time to the areas where you did not score well on your practice test. While all of the subject areas will appear on the test, it is impossible to know how many questions of each will appear, so it is important to have an understanding of all subject areas. Remember to review your stronger subject areas as well, so you do not forget how to solve these types of problems.
Set up a time line for your studying. Allow yourself more time to study the more difficult concepts or concepts that you struggle with. Establish a cut off point when you will stop studying new information. Spend the last few weeks before the test reviewing, polishing and organizing the concepts and information that you already known rather than cramming new information. By setting up and sticking to a study schedule you are more likely to master the concepts prior to test day.