Graduate Record Examination is a test required of most graduate applicants for admission into US schools. It tests vocabulary, reading, logical thinking, and problem solving and math skills of the student. You should Start early and study often to crack the examination. Following are some tips which will help you in cracking the examination:

Start Early
Learn Vocabulary in Context
Take Your Online Practice Tests Seriously
Cultivate a Productive Attitude
Determine your learning style
Decide when you want to take the test
Understand the test format and acquaint yourself to the different test patterns and sections.
Start out by practicing a couple of tests without timing yourself.
Note the sections you spend the most time for and start working to improve on them.
Invest in a GRE study book and use it
Set aside some time every day for the preparation
Make a timetable to complete a section of the syllabus each day
Get a lot of practice