How to prepare for the GMAT in 3 months?
Week 1: Take a diagnostic practice test to see where you stand overall. Learn the basic parameters of each section including scoring and question types.
Weeks 2 – 4: Do as many practice problems as possible for each section and read explanations for any wrong answers. The goal is not just to see whether you are better at Verbal or Quant, but specifically which sections (Critical Reasoning, Sentence Correction) and which question types (strengthening arguments, usage of idioms) are the most difficult for you.
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GMAT
English, like all living languages, is complex and constantly-changing; what is acceptable in spoken English is not always accepted in Standard (written) English. The key to improving your English reading, processing, and writing skills for the GMAT is consistent high-quality practice. 
A large majority of students aim for the September intakes, when the majority of B-school admissions occur. The spring admissions have been considered to be fewer in number and financial support harder to get during that period. 
