Mechanical Engineering

Of course mechanical, because after that you can go into production automobile robotic marine aeronautic etc.

For mechanical engineering in Pune University, you have the following options:
MIT
COEP
VIT
DY Patil
For chemical engineering:
DYPIEMT
MIT-Alandi

Akshay, to get admission firstly you must meet the cutoff score setup by the college itself. This varies every year. In Common Entrance Test, marks that you scored, cannot make you eligible for admission in good govt.colleges. However you can apply under reserved category candidate for govt. colleges. I would suggest you to go for some private college.

Go for Diploma in management and work in a startup. After that, you can pursue executive MBA with work experience.

Try for KSIT and DSATM.

See, the best option is to first study mechanical engineering, and then do one year additional marine engineering. See, you will have vast scope of jobs. You can work on ships or you can work on cars. The choice will be completely your's.

Yes, it is good.
Only if you focus on what you are taught and apply it in the labs provided.
That was the key for many outstanding students of CU mechanical branch alumni.

If you are in category like SC, ST, OBC, then you will surely get best college in Pune. Some colleges are:
Dr. D. Y. Patil Vidyapeeth
MIT, Alandi
JSPM

After HSC, you will have to sit for entrance exams for colleges. If you want to get into one of the prestigious colleges like JEE, BITSAT, IPU-CET and there are many other. You will get a college for engineering according to your score in the exam.
Good luck.