very helpful

for GMAT, you just have to be fast enough and answer correctly if you want to have a chance to solve as many hard questions as you can in the limited time you have (hard questions generate higher scores!). You must be fast and correct. In GMAT, each question serves up a different twist: a different level, uses a different set of tools, has a different length, tells a different story, can take from a few seconds to a few minutes to solve. But, most importantly, it presents us with questions that can be solved in many different ways. Unlike your high school teacher, the GMAT is not interested in learning how you solved each question. these tests help you build your understanding of the actual test.