ok girish.,
First - register on the princetonreview site and login with thy new id.
second- get the book from library and locate the serial number on the last page or some other place on the book.
third - go to this site -
The Princeton Review
fourth - enter the serial number and click start, it should take u to a page where u can take tests...
hope this helps...
newyorkgirl - you are doing really well for urself... if kaplan gets u 680 something, u should end up with 750+ in real gmat for sure...