poor score on GMAT prep tests

i found the real GMAT much easier than the MGMAT questions. I never had enough time during the MGMAT tests, and actually found myself with spare time at the end of the real GMAT. MGMAT is good practice, but take the math scores with a grain of salt. You should be able to score at least as well on the real GMAT as on the MGMAT tests

Guessing last 2-3 questions is almost always better than leaving them un-attempted (there is a penalty for leaving questions un-attempted)... The OG questions reflect the question setter's mindset e.g. testing on application of concepts, not directly on concepts... so do the GMAT prep test questions... but remember, OG questions are old retired GMAT questions (at least 5 yrs old)... a lot had changed in this time and the test has become harder, especially if you want to score in 700s. So take those questions as base line and prepare from there...

In my opinion, I find most of the "tricks" to come from Data Sufficiency. Usually, for Problem Solving you either don't know how to approach the problem or you get it wrong because you make an error in calculation or solve for x when the question asks for y.

For Data Sufficiency, you will get the maximum value from OG if you do every single question and ANALYZE it. Make a mental note or even write down what tricks the question had or what tricks it COULD HAVE had. If you do this process, then you will definitely see patterns emerge. Also, DS is all about reading closely. If a question stem says non-zero integers, then zero is not an option. Keep a lookout for such subtle "tricks." Once you start frantically working on a problem, you sometimes loose sight of the question stem.

I think MGMAT is the closet thing that measures to the real GMAT!!! Quant however is a little tricky in MGMAT though.

@Mike
Most of the people have given the right insights to you regarding Quant and you should definitely work on that. However, one good way of maximising your score is to work not only on your weak areas but also on your strong areas. Your Verbal seems to be good! If you can take your Verbal score higher by another 5-6 points ,that will give you a lot of advantage and take the pressure off from you on performing the quant section.