CAT

Pearson Guide to Verbal Ability and Logical Reasoning for CAT by Nishit Sinha Quantitative Aptitude by Arun Sharma Quantum CAT by Sarvesh Verma Data Interpretation & Data Sufficiency by Arihant.
These are some books, it is quite easy and if you need help you can join crash courses.

Pearson Guide to Verbal Ability, you can also use word power made easy. Logical Reasoning for CAT by Nishit Sinha Quantitative Aptitude by Arun Sharma or SN Aggarwal
Quantum CAT by Sarvesh Verma Data Interpretation & Data Sufficiency by Arihant.

You can take coaching for CAT, if you are not able to understand it by yourself.

Hi,
You must know the exam pattern and syllabus in details, and you must have all the study material with you. Online mock test are available, you must practice them to know what things you have to work on. Utilize the internet to it's best.

Yes, you can appear for both the exams. Most top institutes allot admission based on CAT scores, so it would be better if you focus on CAT and try to score more than 90 percentile. Alternately, you should check on the top institutes that offer MBA in pharma & based on their admission requirement prepare for MAT / CAT.

70 percentile minimum for CAT and 80 for CAT.

I don't think CAT and other bank exams syllabus are same. It may help you to some extent as your English, logical reasoning and basic maths will improve but preparation for bank competitive exams need some separate preparation. It may help you in other MBA entrance exams but not much in bank-related exams.

CAT exam is tough as there are limited seats in IIMS, and there are only few good IIMS like IIM Ahmedabad, IIM Calcutta, IIM Bangalore, IIM Indore, etc. Nearly 2 Lacs candidates apply for CAT exam but seriously 50 K students prepare seriously for it. Paper is not tough if you practice problems and do hard work. Focus on English, logical reasoning, etc. Follow study materials and faculty. Don't skip classes as classes are very important. Simple thing is that many people are fighting for limited seats and you have to defeat everyone for getting those seats.

Hi,
Here we bring you six ways on how to prepare for CAT without coaching. Know the exam pattern and syllabus in detail. Get the right study material. Take online mock tests. Create Study Group. Utilize the Internet. Be confident and stay motivated.
Hope this helps you.

Hi,
Refer this link, you will get all the necessary information regarding CAT Exam preparation:https://www.shiksha.com/mba/articles/how-to-prepare-for-cat-blogId-19617