B.Sc Physics

The colleges include: https://goo.gl/nP1nml

1.Loyola College
Sterling Road, Near Nungambakkam Railway Station, Nungambakkam, Chennai, Tamil Nadu 600034
044 2817 8200 -
2.Ethiraj College For Women
70, Ethiraj Salai, Egmore, Thousand Lights, Chennai, Tamil Nadu 600008
044 2827 9189 -
3.Stella Maris College
17, Cathedral Rd, Chokkalingam Nagar, Teynampet, Chennai, Tamil Nadu 600086
044 2811 1987 -
4.M.O.P Vaishnav College for Women
20, IV Lane, Nungambakkam High Road, Chennai, Tamil Nadu 600034
044 2833 0262 -
5.Madras Christian College
Tambaram, Chennai, Tamil Nadu 600045
044 2239 0675 -
6.Guru nanak college
Velachery road, Chennai, Tamil Nadu 600042
044 2245 1746 -

The eligibility to apply for any B.Sc course is to have completed 12th with a good percentage. You should have taken the following compulsorily:
1) Maths
2) Physics
3) Chemistry
There is no required cut off. At the time of counselling, they will see your marks for admission.
The official website of Loyola College is www.loyolacollege.edu

Good B-Schools accept scores of CAT GMAT CMAT. If one can score above 90 percentile in CAT, then it is considered a very good score and will get a call from good private B-School.
For IIMs in general category, you will have to score above 97 percentile to get a seat in new IIMs.
Colleges look for a better profile overall rather than a single thing like of scores.
GD/PI also play a vital role in selection procedure.

No, there is no compulsion of maths for pursuing B.Sc physics. So, you can go after that.
Good luck.