Bachelors

Well, this totally depends on what the college says. But in general, you can opt for M.Sc physics or chemistry after doing your Bachelors in computer science provided that you did well in physics and maths for M.Sc physics and chemistry for M.Sc chemistry. That means, if you were not having chemistry subject while doing your Bachelors in computer science then you are not eligible for M.Sc chemistry. Similarly, if you were not having the physics and maths subjects then you are not eligible for M.Sc physics. Moreover, if you had those subjects doesn't confirm your eligibility, as you must score good in those subjects which vary according to the colleges.
Thank you and best of luck.

Most PUC (Commerce) students think they could take up B.Com and that's all. Some consider doing CA but the fact is that commerce students have a plenty of options. All you need to do is look around for add-on programmes, integrated courses and special subjects offered. There are a few colleges that offer these high-demand courses.
(1) B.Com (Banking & Insurance)/
BA (Bank Management)
This is a 3-year course with emphasis on subjects related to the insurance and banking sector. After successful completion of this course, one can seek employment in banks for business development, underwriting, reinsurance, agency business, actuarial for the insurance sector. Many colleges offer Banking and Insurance both as options in B.Com while the BA (Bank Management) Course is a complete course on Bank Management.
(2) BCom (Travel & Tourism)/
BTS (Bachelor of Tourism Studies)/ BTM (Bachelor of Tourism and
Management)
The 3-year BCom in Travel and Tourism and BTS/BTM course are designed to prepare the student to adapt to the demands and face the challenges of todays tourism and travel industry. The course has a good balance of theory and practical subjects. The course is aimed at developing the students to become professionals to meet the requirements of travel, tourism and hospitality industry.
The BCom (Travel and Tourism) is offered by Christ University, Bangalore and BTS is offered by IGNOU (www.ignou.ac.in). One can also do a 6 months - 1 year training of International Tourist Guide offered by Thomas Cook or Kuoni Academy and become a well paid tour manager, tour planner, guide as well as set up a travel agency.
A few reputed colleges
Mount Carmel College, Bangalore
Indian Institute of Tourism
and Travel Management,
New Delhi - 110021
Bangalore University, Central College Campus, Bangalore - 560001
IGNOU, School of Social Sciences, Maidan Garhi, New Delhi - 110068
(3) BCom + Company Secretaryship
The Institute of Company Secretaries of India offers the Foundation Course (8 months) for those who have passed 10+2. If a student has enrolled for BCom and has the aim to become a Company Secretary then, she can simultaneously enroll for the 8-month foundation course from ICSI and later after completion of B.Com take up the intermediate course and complete the complete course to become a Company Secretary.
(4) BCom + Chartered Accountancy
Becoming a Chartered Accountant takes a minimum 3-4 years.