GMAT is not a test of intelligence, but a test of perseverance and endurance. If it did, I would probably have an IQ of a piece of wood.
Take a PowerPrep test (downloadable @ mba.com) and see where you stand. Find out your weak areas and work on them.
There are alot of sticky posts in this forum regarding people's struggles and triumph with the test. Learn from them and prepare for battle.
Remember, if there is a will, there is a way!
Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...