Exam

Hello Naveen,
You may use the college and branch predictors given below for COMEDK which may suggest some colleges and branches that you may get with your rank :
1) https://www.shiksha.com/b-tech/resources/comedk-college-predictor
2) https://www.shiksha.com/b-tech/resources/comedk-branch-predictor

It's good in all terms.
Study- you will be getting all the required knowledge and guidance from some top faculties, mentors, dean and guest lecturers from India and abroad as well. Study environment depends on you, on how you maintain it. From the college side you will get the best study environment.

No, they take admission through MHTCET exam conducted by Maharashtra government but if some seats are left then they can take admission through JEE Mains marks.

Yes, you can get admission in UPSEE college. Just take part in counseling process by ATKU. Just check the college details in the link given:
https://www.shiksha.com/b-tech/resources/upsee-college-predictor

Yes, it will give all India rank as they give rank according to your marks that you scored in exam among all the aspirants appeared in that exam.
If you belongs to any category in UPSEE, then they give ranking according to your category also.
Regards.