<p>The key to the GMAT is to learn their adaptive software. If you get a tough math question correct, they give you a harder question next. If you don’t, they give you an easier one. Some questions also don’t count. You have to really get that system down as much as possible in addition to understanding the math itself. I would buy a book to learn the math but one with an included CD so you can practice using their system. It’s tough to get the timing down on when to skip a question. I would really try for a 640+ to have a shot at admission.</p>