CAT

The best books for MBA entrance exam are:
Qualitative Aptitude by RS Aggarwal
Reasoning by Arun Sharma
Quantitative aptitude by RS Aggarwal.

Solve lot of mock tests and give an equal amount of time, if not more, to be analysing each mock. Retry all those question which you got wrong in the exam and those questions you left. Also do as many 1 hour part tests for each section as possible.

The best way to join test series and practice more and more.

A list of top 10 online coaching is provide by Shiksha on its website!
Checkout the link given!
https://www.google.com/amp/s/www.shiksha.com/mba/articles/amp/top-10-online-mba-coaching-websites-you-should-look-at-blogId-11478.

CAT requires high percentage due to its tough competition! Almost 2 Lacs aspirants apply for CAT every year and the cut-off percentage goes very high!

Nope! CAT score is accepted all over the india only for management studies!
Good luck!

CAT is accepted by almost all the B-schools in India and most popular exam for MBA! CAT is harder to crack than MAT. Good luck!

Hello! Yes, it is the best way as all the Iims and some major non-Iims accept its scores for their admission processes. However, there are other exams too like XAT SNAP NMAT, CET, IIFT etc. Which can also get you similar top-ranked colleges. Good luck!
P. S. No reputed college gives direct admission.

Visit the link given below to get full information about the pattern of the CAT:-
https://www.shiksha.com/mba/cat-exam-pattern
CAT is difficult due to high competition, advance aptitude, Reservation, Admission criteria!
Good Luck!

No, it is not compulsory to join a coaching for any Exam! You can prepare yourself, just believe on you, make a goal, be dedicated and focus on each term!
But, if anyone helps you and guides you to reach the goal then it's not a bad idea! Coaching works as a coach in your life they give you the direction and In coaching you will meet new peoples and compete with them, This improves your skills!
Good Luck!