Exam

For physics, reference books are: Dinesh+ Concept of physics (Part 1 and 2).
For chemistry, reference books are: O. P. Tandon+NCERT
For maths, reference books are: Dinesh+NCERT
Moreover, go through the last 25 years JEE Advanced question papers.

Hello,
To get admission in any good or reputed college, one has to appear for an entrance exam and clear the eligibility criteria and interview rounds (if shortlisted for them).
https://www.shiksha.com/mba/articles/20-mba-entrance-exams-you-can-take-this-year-blogId-11473
Kindly visit this link to kn

Yes, actually to appear for UPSC exam, the minimum qualification required is a Bachelor's degree.

You are advised to wait for one year and prepare well further.

It depends on the cut-off for the year. On an average, it is around 140-100.

Yes, you should go for coaching classes because it will help you practically. If you have completed your 2nd year then it is the best time to take coaching classes and you will get ample of time to do self-preparation but please try to get admission in a really good college, not in any private colle

For MAH-CET, you can refer to:
1. RK Jha
2. Disha Publications
3. GK Publications
4. Verma publications
For CAT, you can refer to books like:
1. Nishit Sihna
2. Arun Sharma
3. Arihant Publications (good)
4. VRC (verbal and reading comprehension)

If you have not done good this year but you think that you perform better and if this is your confidence level then yes, you can drop a year to prepare for JEE Mains. But also remember if you are dropping a year then you have to study really very hard so that you can get a seat in IITs/NITs. This sh