Even if math is your strength, the GMAT is not designed to test your math skills said skills apply to engineering. It's designed to stratify people based on problem solving skills. In any case, you only need 2 points in math yo get to the 80 percentile, while you need 6 points in verbal.
Do you know what subsections are giving you trouble? This could be a big part of the key to overcoming these thresholds and breaking to more advanced problems on the real thing.
Thanks Mohater for your reply.In math section I am not sure what went wrong.I can still remember the questions that popped up during the exam but I am unable to grasp what went wrong.I was able to answer every question without any issue(so no clue on math).
As far as verbal is concerned the first passage was on a topic that I wasn't interested in and this made me lose concentration.probably that passage and couple of questions after the passage cost me 2 -3 point on verbal.