General GMAT Questions and Strategies | 730 10 days before test! .. Any possibility of improvement?

Hi

Firstly, I would be really grateful if anyone here would be able to help me out!. My gmat is scheduled on 23rd august 2014, Today I scored a 730 (Q50/V39). I am making mistakes in sentence correction as well as critical reasoning. The prime reason being lack of concentration at the end of the test. SC has been my weakest points till yet. I really want to improve on verbal even though I know I have limited time left. !
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