Beat The GMAT a GMAT & MBA community

I am well into one month of preparation, given it about 5 hrs a day. I'm using MGMAT Strategy Guides and they have really helped unlock some secrets, especially in the quant section. I've wrapped them up except the advanced set in some of the guides because i wanted to structure my preparation and also to prevent boredom. I recently took two MGMAT full length tests and got 520 and then 590. I'm a development professional with six years of work experience and I'd like to aim for a 700 plus score to get a good chance at one of the top B-Schools. Could you please help me with improving my scores? I've worked quite hard over the last month and am frankly quite taken aback with such low scores. I'm taking the GMAT on April 29.

Some guidance will be much appreciated..