how to improve my score in one month.

First of all, if you plan to study for more than 5 hours a day, then believe you your preparation may prove out to counter productive.Limit your study time to 5 hours a day and take a day off in a week. I think the part where we get the GMAT wrong is that we think that the GMAT is our end semester exam wherein by studying for as many hours as possible, you'll get the desired score. That is simply not gonna happen because the GMAT is not a test wherein you'll be tested on a particular set of questions as in the case of your end semester exam .You have to give your mind enough free time that it is able to "connect the dots" ie. it is able to synthesize whatever you have studied.
A 360 on the GMAT means that you have probably bombed both the Verbal and the Quant sections. The first thing I'd advise you to do is divide the next month in blocks of study period ,devoting 3-4 days to one area so that you are able to become reasonaly competent in that area by doing a focused study. To suggest the right course of action you need to tell us more:
How good were your concepts when you prepared? Which all books did you prepare ? How much were you getting in your practise tests? Which areas did you find daunting and which areas did you feel comfortable in? The answer to the questions above will really help you chart out the right strategy so that you don't end up getting the same score the next time around.