1. Get the Official Guide, Do every single problem and
Understand every problem. DONT even think of using process of elimination until you run out of every single option to solve. process of elimination kills learning. That method MIGHT be ok when you are taking a practise test, but never ever use POE in your actual prep, coz you are making a short term decision to get a problem right and in return, you learn very very little.
On the Real GMAT, it obviously ok to use POE. hope this is clear.
2. Measure, Measure and Measure your progress. I cannot emphasize this enough. See where you are going. Are you doing the same mistakes? Is there a trend in your errors? Are you doing a lot of careless mistakes?
These and more questions need to be answered by you at very regular intervals. Why? the objective of practise is to improve, not to get every single problem right .
3. How good are you on concepts? if i asked you to explain a probability problem or a combinations problem, would you be able to explain it to me in detail. why dont you come over to the math forum and try to explain problems that are posted. it will help you improve your concepts. The best way to learn is to teach... try it for a day or two. Explain every problem in detail. Instead of solving hundreds of problems and not getting anywhere, try explaining, say 50 problems of each type. you are most welcome to explain stuff to members here. the worst that will happen is that you will find out .. oh.. the way i used to think was this... but it turns out its not that way..... Let others point out mistakes, if any, in your explanations. you will never forget that again. There is no shame in being wrong. there are no guru's, no experts...we are all here to learn. So, go ahead , try participating.
4. Are you working to eliminate errors? With practise, you should NOT be making the same errors over and over again. did you check that? any way you measured that? Do this every , and in your case, every single day.(you have less than a month for your test).... Make notes and strategies based on your errors. for example, if you miss an important detail while reading a problem, your strategy should be to allocate as much time as possible to read the problem. try this strategy with the utmost discipline and see what happens until next week...depending on your situation then, add to your overall strategy.. what this will do is help you customize your strategy to eliminate your weaknesses.
Finally, no matter what i say, you need to have the discipline and the motivation to go get what you want. Just think why only 5% of the test takes have a 700 or more. You want something extraordinary, better do something extraordinary.
I hope these broad guidelines will help.
Praetorian