Colleges in Mumbai

Hello,
It's quite tough to say as to what percentile will get you admission. However I am attaching a link that will predict college for you based on your ranking in JEE Mains. I am attaching a link that will predict college for you based on your rank. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Best wishes to you.

The salary depends upon one's caliber, confidence and knowledge.

St Xaviers College, Mumbai
Ramnarain Ruia College, [RRC] Mumba
Ramnarain Ruia College, [RRC] Mumba
Bhavan's College, Mumbai
SIES College of Arts Science and Commerce, [SIESASCS] Mumbai
DG Ruparel College of Arts Science and Commerce, Mumbai
VK Krishna Menon College of Commerce and Economics and Science, [VKKMCCES] Mumbai
These are some college for this course in Mumbai.

I think admission for B.Com is closed now, that's why you can't see application form for B.Com.

Yes, you can take admission in Government Polytechnic for Diploma in Computer Engineering.
The minimum eligibility criteria for admission in this course is that candidate must have passed 10+2 examination with at least 35% marks in 10th standard and Candidates passing 10th standard from Maharashtra State Board must have Maths/Mathematics and Science & Technology as compulsory subjects.

It is quite difficult to get admission in 2nd year directly in that college.

Yes, you can do the B.LIB course after class 12th.
Best colleges in Bangalore University, [BU] Bangalore.
Chethana Educational Trust, Mangaluru
Jyoti Nivas College Autonomous, [JNCA] Bangalore.

For admission in M.Tech in engineering Physics, GATE is an entrance exam for M.Tech. GATE 2020 will be conducted by IIT Delhi. You can check it by clicking here:-
https://zeenews.india.com/india/gate-2020-exam-dates-gate-2020-result-dates-announced-on-gate-iitd-ac-in-check-details-here-2217925.html