Accounting & Commerce

Your score in 12th is really good. Composite score which will formed will be moderate. If you are willing to go till the last rounds in the admission process you might get a good college in engineering. Opting out for Commerce will change your whole stream(field). Though there is no harm in doing th

There is no problem with you pursuing B.Com and MBA after that. You can definitely proceed with the same, but it will be a little difficult for you to catch up as compared to the Commerce students. But, since you seem interested in the course you might catch up fast, if you put in a little bit of ex

You can't change the college. But, you can change your stream or branch after 1st year. If you want to change the branch, you must get 75 % or more. You can ask your mentor for further process.

You should opt for a Master's degree such as MBA.

Yes, you can get admission in a good college.

There are various Colleges in Pune which offers Bachelors degree programme in Commerce. In order to be eligible, candidate must have completed the +2 level of exam with good aggregate marks from a recognised Board. Following are the list of some of the very best Commerce Colleges in Pune:
Brihan Maha

Yes, you can definitely opt for M.Com in your Master's degree. Kindly read about the comparison here:
http://management.ind.in/forum/mysore-university-vs-bangalore-university-171217.html