Prepare well before exam. If you feel you need more practice then reschedule your test. GRE score is important if you feel you are not prepared its better to reschedule exam. Your goal should be to get into a good school and not to ANY school.
First 15 Questions of each section are most Important!
Most of People will find quantitative section most easy but be careful,
avoid making silly mistakes. Note you wont get extra score if you finish this section before time!
Questions on Probability, Permutations , combinations , mean, mode, standard deviation are common. Be patient in quantitative section. Quant section is most important for Engineering etc students
Verbal section is toughest for people not having English as native language, best solution is to learn as many words as possible. Verbal section is important!
Answer all questions in each section. There is NO negative marking for questions
unanswered. So at last 2 minutes just guess all remaining questions.
Don't panic even if your score is low!
Do you know that you can send official GRE scores for up to 4 Universities for free?