Need your help

Hello everyone, I'm tired and exhausted and I need your help. I actually don't know how I can improve my score. I studied for 3 month from all MGMAT guide and I did twice the OG 2017, but my CATs are same score: had 3 CATs more or less around 580 52%Q 52%V. I just want a 660/650 (but, since I'm real...