Understand the Test

The GMAT is not like any other exam. In particular, it doesn t have very much in common with college tests, and there are plenty of important differences between the GMAT and other standardized tests like the SAT, ACT, LSAT, and GRE.
Before you can successfully approach the test, you need to know how the computer adaptive mechanism functions. You need to be familiar with the length of the exam and the range of tested material. In particular, you need to thoroughly understand how Data Sufficiency questions work.
If you don t know how you ll be tested, it doesn t matter how well you know the material. It s like showing up at an event and giving an unrehearsed, impromptu speech while everyone else has practiced their speeches, word for word, for months.