Kindly go through the following link.best-gmat-books-reviews-recommendations-for-your-prep-77703.html
If you are planning for a self study, I think you should go for one resource only. It can be MGMAT, Kaplan
or Princeton. For CAT analysis of different companies, check this one outall-gmat-cat-practice-tests-links-prices-reviews-77460.html
If you are going for a course then obviously one course is sufficient for 700+. For more on available courses, check this outgmat-prep-partners-156/
Hope it helps!
thanks,Hussain15. i plan for self-study. why should i go for one resource only? shouldn't i go to for resources so i have more practices? please comments!