Check out the official GMAT website (where you sign up for the test.) There are downloadable materials and I believe even practice tests you can take to check how you are doing.

Only problem with the practice tests is that there's no really good way to grade your analytical responses. I think that unless you take a real class with personalized instruction, there's not a really good way to do that anyway though.

Otherwise, I think Princeton Review makes good books. Not sure about other companies though, maybe somebody else has a recommendation.

Knewton has the very best GMAT practice tests around. And you can take them on the computer, like you can the real test.

*Disclaimer: I work for Knewton, but I can say with full confidence that our practice tests really are great.

You can also get a 7-day free trial to the full course, which gives you a practice CAT free of charge.

Check it out:

knewton.com/gmat

Good luck!

Josh

thnks guys.

i have a one yr old kaplan cd.but it dosent work now? do i need to buy it once again?
and how many mock tests do you think shd do my confidence good?
any other prep reqd..m nervous abt quants
wud knewton help