Tip 1: Do the official GMAC computer adaptive tests. Computer adaptive tests will be an excellent trainer to prepare for the GMAT. Moreover, these tests help to direct their thoughts attention and energy in the right direction.
GMAT Prep & Power Prep Official Free GMAT Tests – post by timetrader
gmat-prep-power-prep-official-free-gmat-tests-77548.htmlTip 2: Before you spend a lot of money on private tutors, courses and other things, decide what exactly you need. In other words, you need to independently determine your level of knowledge, as well as see what areas you need to concentrate. Based on that, you can make a decision what materials to buy, what courses to take.
Best GMAT Books 2012 – Post by bb
best-gmat-books-118706.htmlTip 3: Motivation. If a person wants to achieve something, he or she should stay motivated. Think about the better education, better job, and better life you will have.
Motivational article.. "How to Become a Great Finisher" – post by eGMAT
motivitational-article-not-a-debrief-128464.htmlTip 4: Do not focus only on the GMAT and GMAT review courses and materials. Read books, magazines, and newspapers. Participate in the forum. Try to challenge yourself with hard math problems.
Books to Read (Improve Verbal Score and Enjoy a Good Read) – post by bb
books-to-read-improve-verbal-score-and-enjoy-a-good-read-76079.html 
for your kudos!