CPT

Hi Vaishali,
You are going from science to commerce.
Initially, it might take you some time to understand the basics of commerce, but you'll be fine.
Regular college or not, should completely be your decision.
Anyways once you clear your cpt and proceed ahead with CA course, you have to have your training which might clash from your college.
Plus your CA exams might also clash from your college exams, depending on the college where you get admitted.
However, if the doubt in your mind about joining a regular college or not has creeped up due to your decision of going with CA then it's baseless.
You can easily cope up with both graduation and CA together.
Further to inform you, it is suggested that you go for B.Com only. See if you get B.Com honours then its good else regular B.Com is also fine since you have that CA tag alongside.
Also, just for you to think, if at all you wanna go for correspondence graduation, I would suggest have a look at the ignou collaboration with ICAI wherein you have to give less papers to get your B.Com honors degree.
Think wisely, decide accordingly.
All the best.
Feel free to revert in case of doubts.

CA after class 12th (CPT ) Common Proficiency Test (CPT) is an entry level test for Chartered Accountancy Course. It is an objective type test of 200 marks of 4 subjects namely, Fundamentals of Accounting, Mercantile Laws, General Economics and Quantitative Aptitude with an objective to test the basic knowledge in these subjects. CPT is divided into two sessions of two hours each. In the first session there are two sections: Section A Fundamentals of Accounting carrying 60 marks and Section B Mercantile laws carrying 40 marks. In the second session there are two sections: Section C General Economics carrying 50 marks and Section D Quantitative Aptitude also carrying 50 marks. These two sessions are of two hours each.
CA after Graduation Students who have graduated in Commerce with 50% marks, non- commerce graduates with subjects other than Mathematics and an aggregate of 55% and non-commerce students with Maths and an aggregate of 60% do not have to appear for the CPT test and can directly register themselves for Integrated Professional Competence Course (IPCC).
During the course in various groups one has to study Fundamentals of Accounting, Mathematics and Statistics, Economics, Mercantile Law, Accounting, Law, and Auditing, Cost accounting, Income-Tax & Central Sales Tax, and Organization & Management and Fundamentals of Electronic Data Processing.
For the final examination one has to study: Advanced Accounting, Management Accounting, Auditing and Company Law, Direct Tax Laws, Corporate Management, Secretarial Practice, Managerial Economics and National Accounting, Operational Research and Statistical Analysis, System Analysis and Data Processing, Costs Systems and Cost Control, Management Information and Control Systems, Tax Planning and Tax Management, Management and Operational Audit.