Hey buddy, first of all, keep ur head up! Thats just what the GMAT sometimes does to people. U just gotta stay strong and study hard for the next time!!!
My problem was in the IR. I really needed to have a toilet break and took an unscheduled break for 2 minutes, which was a bad decision as I had close to 4 minutes left with 4 questions to go. I guessed the very last question of the IR section and as I was about to press Confirm, I ran out of time. I'm sure this brought down my score-- I'm not sure by how much though.
Secondly, I think you should buy the MGMAT books
and at first get acquainted with the GMAT structure... --> The IR cannot bring down ur score because it does not affect it in any way. U are scored according to ur performance on verbal and quant, but NOT on IR and AWA.
If you got any questions, here is the place to ask
With all the best!