Improve your GMAT score with NO extra studying

I am on scholarship program and it really is my 1st time to take a GMAT test. I am scheduled to have the exam on dec 22! very short notice ,right?? but i have started studying since the first of September. I am not trying to find a high ranked school so i just require a 550 score but the issue is that i attempted the gmat prep exam 2 times and i got 380 and 390. I don't know what is wrong, i study daily for not less than 5 hours , i completed all kaplan questions and working on OG 2015. So can anyone help me ??BTW I am not a native speaker and that makes the CR part my most severe nightmares.
 
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