CMAT Preparation

I think you should join any coaching institute that has good material for reference, opt for test series and analyses your mocks on regular basis. It is better, if you make a planned chart for your preparation. All the exams have different difficulty level as CAT and XAT are on a higher side, whereas MAT and CMAT can be easily attempted after giving some extra efforts on general awareness.

Hello Harshit,
Your CAT score is very good. You can definitely get good colleges in India with this percentile. Since, you are specific and want admission in B-Schools located in Mumbai, then you can refer to below link for the list of the best colleges in Mumbai.
https://www.shiksha.com/mba/colleges/mba-colleges-in-india This link will help you in finding the best colleges in Mumbai as per your needs and career goals.

Hi,
The best coaching institutes in Delhi and Kolkata for CAT, CMAT and MAT preparation are IMS, TIME and Career Launcher. You just need to check the faculty and the reparation material for the best coaching institute.

Hi,
This link can help you: https://www.shiksha.com/mba/exam/cmat/preparation-tips

Hi,
Below links will help you to prepare for both the exams:
https://www.shiksha.com/mba/exams/cmat
https://www.shiksha.com/mba/exams/xat

There can't be one single book. English needs a steady improvement being our Second Language. Much depends on our career needs. If we are in a competitive field, we need good English and an observation of present-day trends. So, gather your material and refresh your knowledge from time to time.

Collect all the old questions papers and analyse what type of questions are asked then start noting down the chapters one by one as per your interest. Start practicing all those chapters. Read newspaper, books and other stuff to increase your GK, vocabulary, etc. Also, read case studies for better reference.

Hello Jinal! https://www.shiksha.com/mba/exams/cmat
Kindly visit this link to know about the CMAT exam and its preparation strategies.

Join Mocks, IMS is good for concept builders, TIME/IMS mocks are good, give mocks as many as you can. Start building your basics with books by Arun Sharma/ RS Aggarwal for quant/LR/DI/Verbal. For vocabulary, you can go for Word Power made Easy(Norman Lewis).
All the best.