B.Com

Hello Abhishek,
As you have completed your 12th with commerce, it is better for you to join B.Com
It worth and falls under your 12th stream. But if you go for Polytechnic, you may suffer.

Applicants who have passed B.Com one-year with minimum of 50% marks are eligible to get admission in B.Com (Hons), while for admission to B.Com (general) course, the minimum eligibility criteria is candidates must pass 10+2 with any 4 of these subjects Mathematics/ Statistics/ Commerce/ Accountancy/ Economics/ Computers or any vocational subject under commerce stream.
Good luck.

Refer the following link:
http://www.npgc.in/Admission-Eligibility.aspx

Yes, maths is necessary to pursue B.Com in Delhi University. According to Delhi University the admission for this course is based on best 4 subject's marks including maths. For further information regarding admission process and last year's cutoff visit DU website.

Hello Vibha,
Commerce is a very wide field in terms of study and job. You can do cost accounting, corporate accounting, finance course and taxation course. These are certificate courses. You can do also CA, CS and ICWA these are the main courses of the commerce field. If you can attain a good knowledge of taxation, then you can get a very good job.
Thanks.

Hello dear,
Yes, you are eligible for B.Com (Hons). Take part in the counselling round, otherwise, directly apply for colleges.

This information can be only given by authorities of the college. Try contacting them through their contact info.

There should be very good opportunities for a person with said qualifications. Infact he may not even need to apply for jobs but rather be getting invites. If that person has a good LinkedIN profile and good Social Exposure he will not have any trouble finding a suitable job.

Most probably No. 80% for general category is not enough for admission into this college. Check last years Merit List or Cut Off List to know the minimum marks required. Last year my friend who scored 82% and was general category also wanted to take admission in the same college but wasn't alloted a seat.

For B.Com Entrance exam, usually 12th class syllabus with a little bit of General Science and Reasoning is asked.