Commerce

You can pursue BCA and MCA later.

First, complete class 12th, and go for CA. And, also you can go for CA after B.Com.

Yes, You can do MBA. It will be good for you.

If accountancy is your flavour, the CA and CWA are good, but if you wish to become a company secretary, then CS is good. You can also offer your consultancy services.

A professional course in mass communication opens doors for a career in films & TV, publishing, public relations, journalism, editing, direction, filmmaking, scriptwriting, production, etc. Depending upon personal interest and inclination a mass communication professional can choose a job. So you can join mass media.

If your sister is good in studies then she should try for CS after 12th or else there are many different options such as B.Com, BBA, BCA, BBM, B.Com and LL.B.

You need to qualify 10+2 with science for pursuing B.Sc in anthropology. As a commerce student I don't think you can do any technical course in science field.

Your B.Com degree should atleast with 45%.

You can go for pursuing CA Chartered accountant) just after your class 12th, and mind you, this is one of the highest rewarding career options. This profession is regarded very prestigious in our society as well. You may go for management through the route of either BBA or MBA. I suggest everyone to pursue MBA if you want to make your career in Management sectors. Doing BBA is just waste of money because it does not give high position jobs. BBA graduates have to do MBA as well if they want to get a decent job in an excellent corporate sector or government sector.