Need help... GMAT in 3 weeks

If you're hoping for a very high score, then yes, postpone your test. Keep in mind that 700 is a very high score, and most people *never* reach that score. That's what makes it desirable! It's like having a million dollars--if everyone had a million dollars, it wouldn't get you much. If you want a high score, you're going to have to put a whole lot of time and effort into the preparation process. Without knowing more about your particular skills and situation, it's hard for me to say how long it will take you to improve, but many students spend months of hard work (15+ hours/week) to get a 100-150 point improvement. This is a tough test, and it has a lot to it. If you're really committed to this task, you'll need to work on solidifying your skills and putting them into practice under time pressure. The endurance element is also very important, so you should also get used to taking *full* timed tests. If you have our books, you have access to 6 CATs. You can also get 2 free CATs from mba.com. Use these exams periodically to see how you're doing. Don't waste them by breaking them up; take the whole test--essay, IR, and all.

Schedule your test when you've gotten a score you'd be happy with on at least one full CAT exam. Before that point comes, you'll probably find that you need to work back through parts of our strategy guides, looking for holes in your performance and reviewing until those holes are patched up. Use the "Generate Assessments" feature on the CAT Exams page in your Student Center to run a comprehensive assessment of your exams and identify focus areas. Try using the review process I described in this post earlier today: 40-days-of-study-a-waste-down-and-depressed-135595.html

Good luck!