Commerce

I think that HA College of Commerce's admission procedure is based on HSC examination.

First, you'll have to complete your 12th with good marks in order to pursue following courses-
1. B.Com
2. BBA
3. BMS

Yes, you can make your career in economics through BA economics. You can also go with B.Com and BA.

Yes, you can pursue MBA in any specialisation regardless of any commerce background. Students from various fields like B.Tech CSE, B.Tech mechanical and many other pursue MBA. But one must clear an equivalent test for admission. One must have a good percentile or rank in CMAT, XAT or CAT. In some private universities these test are not compulsory, they have their own test for eligibility and sometimes these CAT like test are used for giving scholarship according to rank and score.

Hello,
BJB Autonomous College, Bhubaneswar, Odhisa has no criteria for UG admission except +2 pass marksheet. There is no faculty for BBA course in BJB.

He will be able to get admission in Hansraj College under ECA as his marks are very good in class 12th commerce.

Just go through the basic concepts of the B.Com syllabus and some of 12th also. Practice past year question papers or buy a test series online to practice more and more. Further you can buy some good books like Arihant's M.Com entrance guidebook, etc.

Depends if that ECA is in DCAC or not
Given the trials and clearing it you can opt for any college that has ECA you are looking for.

Go to Delhi College of Arts and Commerce (DCAC) or SGBT college. They both are equally good. In fact, I have heard that DCACs crowd is very good. Make it your 1st option if not very fond of an all-girls college. SGBT college could be your second option then.

If you have completed your class 12th Science, then there is no procedure to change your subject to commerce. You can directly pursue BBA B.Com (Hons) or any such type of Commerce field.