Hi Niharika....
It depends upon person to person. I think you should make Proper study plan for 4 months and do quality study not quantity.
I think this would do in 4 months:
1) Complete Manhattan Maths books ( if your maths is good you can complete this very fast) and Download GMAT club Maths book and take notes on it. ( You can download
Manhattan books from the internet)
2) Start with Manhattan Reading Comprehension Book and after completing it, start Practice everyday 1 or 2
OG RC questions. Focus on the mistake and learn. Do not try to solve more than 2 RC question in a day. ( You can download
OG 2015/13 from the internet, it is sufficient for practice. DO not buy the latest one because most of the questions are same)
3) Study CR from
Power score CR bible, I think it is the best book for CR. Study the question properly. Do not rush into complete this book. Study at slow pace, because you need to understand every question with every option. After completion of this book, start solving questions from
OG. I would say 2 to 3 Questions every day.
4) Start Sentence Correction from Manhattan book: I think this is the best book for SC. Just solve all the question and Download GMAT Grammar book and make your own notes on it. After completion of this book, start solving questions from
OG.
5) After completing all the books and
OG, Stop for awhile and think what you have learn, start looking in your mistake and make your proper approach. Do not see that how other people solve the question, just think how you will solve the question accurately and in time. You own approach is very crucial. Many institute just tell you about how to solve the question but you have to make you own method.
6) Regularly Solve question in GMAT CLUB because you will earn points , using which you can Redeem
GMAT CLUB Test for free.
7) Solve GMAT CLUB Quant Test. They are very good.
8) Purchase or Redeem points to get Veritas Exam pack or Manhattan Exam Pack. Solve all the test and improve yourself.
9) Solve the Remaining GMAT official Test or purchase the new one.
Finally, If you think you are ready then go for it. If not I would not suggest to waste your money, time and attempt.
I think this is the way I'll study. Hope you will find some good information from this.
My good luck to you. Hope you score well.