Using the free question bank is a the basic first step you can make to improve your GMAT score. If you want to make a quantum leap and dramatically improve your score, we suggest finding a local tutor on our site and setting up a study session. You can browse tutor profiles and view the feedback they receive from other test-takers who are getting tutored by them. Some tutors have contributed their own material, authored tips and questions, so that you can get a feel for their knowledge of the GMAT. If you're even mildly interested in setting up adding a tutoring session to your prep regimen, why not email some tutors and find out what their expertise and rates are?