Accounting & Commerce

You can choose between M.Com and MBA after completing B.Com. You can also obtain professional qualifications such as CA, CFA, etc. You can also do certifications such as NSE, IIBA, etc. to enhance your employability. You can also do skill based courses. If you had mathematics as a subject in class 12th, you can also do MCA.

You do require any special degree to become a book keeper. But, if you really want to be a book keeper then some institutes provide certification courses for the same.

The scope of CS is good in terms of career in corporate industry.

Yes, you can pursue graduation while you are pursuing CA and you can also pursue CA in commerce field as it would be helpful in your career.

Yes you're eligible for FMS delhi.
Finance, Marketing, Organizational Behavior & Human Resource Management (OB & HR), Production and Operations Management, Entrepreneurship, Information Technology Management, Services Management are offered.

If you are interested in management then go for BBA and if you want to be a tax expert then go for CPT. It depends on your interest.

You can learn about trading and equity research from NSE which offers various courses in trading and shares, capital markets, forex management and derivative, etc.

You can go after MBA in retail management which has good scope into all retail outlets which has seen exponential growth, alternative is MBA in marketing where you can get wide variety of roles in all sectors.

Yes, you need to register yourself first as a student at ICAI. After completing your registration you can fill up the form of CPT. I would suggest you to join a crash course batch for 1-2 months after your 12th and prepare well for CPT.