Is it possible to prepare for MAT in 3 Months.I am planning to write MAT in February 2018

This time is sufficient to get preparaed for the exam if you use it with quality of your study. The MAT examination is divided into five sections which are:
Language Comprehension
Intelligence and Critical Reasoning
Data Analysis and Sufficiency
Mathematical Skills
Indian and Global Environment

You can follow some preparation tips for MAT preparation.

Strategically plan your time: Plan a study routine in advance, allotting time for each subject. This will help to systematically study each subject.

Solve sample question papers: Sample question papers gives an idea about the topics, the standard expected, and the skills required. Practice and solve problems extensively.

Practice regularly: The sections on Data Analysis & Sufficiency and Intelligence & Critical Reasoning may be new to you. These are more tricky than difficult.

Improve your general awareness: The Indian and Global Environment section test your general awareness. Extensively follow the news dailies and magazines, watch news channels and browse the Internet to keep updated with the current affairs related to different national and international avenues. Solve as many papers as possible.

Enhance your speed and accuracy: First, solve papers subject-wise, maintaining stipulated time-limit.

Good Luck!