Commerce

Yes, you can, but it would be hard to say in which colleges you can get admission. Most of the top colleges have strict admission criteria.

You have to select the subject for NET exam based on the subject. You have studied in your PG degree, so you are eligible to take only commerce subject.

No, it will not work. Most of the Science disciple course demands PCM or PCB from class 11th onwards.

If you are interested in pursuing this course, you can apply for this course.

Yes, a commerce student can take admissions at NIFT as well. For Bachelors programs, you should have an education of 10+2 equivalent, And for Masters Programs, you should have a Under-Graduate (UG) degree. Now just to give you an idea about the NIFT entrance examinations (overall):
There are five components in the exams: GAT (General Ability Test), CAT (Creative Ability Test), Situation Test, Group-Discussions & Personal Interview
The structure and weightage of the questions varies for Bachelors & Masters programmes.

You can start preparation for entrance exams like law, BBA or some computer courses or CA.

You can go for Bank PO, CFA CMA, ICWI, ICMAI, CS FRM, UPSC exams, LLB, SSC and many other exams.

Yes, you can but you must be 10th passed for the same.

You have to register under UPSC and then you have to prepare for the written test. After eligibility, you have to prepare for group discussion and personal interview round. For more, visit NDA's official website.

You can go for Diploma and lateral degree and then you can be an engineer.