How to improve the Score by 60-80 Points in 60 Days??

Hi, I took the GMAT offline exam couple of days back and scored a decent 660 (V32 and Q49). Naturally I am not satisfied with my score and want to improve on it. I plan to reatke the Test in couple of months time. Being a Non Native Speaker and a STEM Graduate, My aim is to Reach Q51 V>35 in order t...