CAT

Dear Ajith, please be informed that you are eligible to get admission for MBA at Kodaikanal Christian College. This PG degree is affiliated to Madurai Kamaraj University. Please apply as soon as possible. Contact Mr. Richard at 09865265770. Thanks and regards.

I think Self study is the best tool.
I would recommend that you try out the study material from IMS / TIME / Career Launcher as your first resource.
Some of the Books recommended for CAT are-
1.How to prepare for Data Interpretation for the CAT   TMH / Arun Sharma
2.Pearson Guide to Quantitative Aptitude and Data Intrepretation for CAT by Nishit Sinha
3.Quantum CAT by Sarvesh Verma
Know more about CAT on :
https://edudrona.com/common-admission-test-cat/#1464927769900-a0617f54-da37/?mref=tanu

Self study is all that matters ! I would suggest you that - write a mock CAT to figure out your strengths and weak areas. Depending on your score you can figure out when to start preparing. Its possible to score well in CAT by preparing rigorously for 4-5 months if your basics are good.
Know more about CAT on :
https://edudrona.com/common-admission-test-cat/#1464927769900-a0617f54-da37/?mref=tanu

Hi,
These are some of the best institutes which offer CAT coaching :
1.Career Launcher
2. IMS
3. TIME
4. Bulls Eye
5. PT Education
They offer excellent coaching for CAT in India.

No, it is not at all necessary. Self study is all that matters. But take mock tets daily. Here are some good books which can be used for CAT preparation :
1.How to prepare for Data Interpretation for the CAT   TMH / Arun Sharma
2.Pearson Guide to Quantitative Aptitude and Data Intrepretation for CAT by Nishit Sinha
3.Quantum CAT by Sarvesh Verma
Know more about CAT on :
https://edudrona.com/common-admission-test-cat/#1464927769900-a0617f54-da37/?mref=tanu

Start self study. The areas which you need to work on to excel in CAT are you logical reasoning skills, Vocabulary skills, Mathematical Skills ,Quantitative and Qualitative Analysis Skills and conversation skill.
Some of the Books recommended for CAT are-
1.How to prepare for Data Interpretation for the CAT   TMH / Arun Sharma
2.Pearson Guide to Quantitative Aptitude and Data Intrepretation for CAT by Nishit Sinha
3.Quantum CAT by Sarvesh Verma
Know more about CAT on :
https://edudrona.com/common-admission-test-cat/#1464927769900-a0617f54-da37/?mref=tanu

There is no official document which states the fact. If you consider for the interview purposes, maybe some people might have a bias. But the interviewers of IIMs are experienced enough to not let these biases affect the decision making.