I am new to the beatthegmat. It is actually an interesting resource for those interested in taking GMAT. I scored 660 on GMAT last year and want to retake. Could have done much better on quantitative, but kind of did not follow the right strategy throughout the test. Now, want to be fully confident that will master the tough questions without exceptions. Could you advise a useful guide for combinatorics and probability questions as well as a good practice set. Where can I get the Veritas GMAT. I know used copies are availabe on Amazon, but the cost is sky high!

Your help is much appreciated.

arthur