i am doing CAT but i can't able to understand?

If you're not able to understand below mentioned books will help you in proper understanding with kucid approach and is widely recommended by Toopers for self preparation. For Quants and Data Interpretation you should refer to Nishit Sinha book.You can akso take Up TIME coaching material. For Verbal ability and Logical Reasoning, Book by Arun sharma Mcgraw hill Publication is considered best. Word oower made easy is wonderful book by Normal lewis for Verbal ability and is recommended. For paper pattern check below. https://www.google.co.in/amp/s/bschool.careers360.com/articles/cat-exam-pattern%3famp You can also take up help of Coaching Institute like TIME or Careerlauncher if you still fin difficulty.

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Taking coaching will not help till you understand the motive to join the coaching and why you want to pursue MBA.
Make sure whatever you study in the coaching centre you take out time to revise the same in home and try to clear out doubts the very next day in the class.

Also apart from what you study in coaching, you will have to take out time for personal study time. You should atleast give 3 hours as the exam is nearby.

Give previous year sample papers and understand in which sections you are good in and where you need to work hard and get a hold over it.

Give online/offline mocks and understand your strengths and weakness and analyse it accordingly.

All the best.