Accounting

There are many short-term Diplomas in commerce field, you can do Diploma in import and export.
Diploma in foreign trade.
You can learn other languages like German and French.
There is Diploma in taxation also. You can do that. Also, these all Diplomas are short-term and you can complete it in one year.
If you are interested in the computer field then you can learn computer language also.

Generally, the interview has you an introduction, stream knowledge and experience details. However, specific question depends on the post that you are applying for.

There are basic theories which are required by a B.Com student which are considered as basics of accounting. They include double entry system, rules of debit and credit, accounting concepts, journal, ledger, trial balance, cash book and its types, subsidiary books of accounting, purchase books, sales book, financial statements for BO and NPO, types of assets you and liabilities, capital and revenue expenditure and receipts, bills of exchange, etc.

Yes, there is an opportunity of learning basics of accounting and finance.
Do certificate course/ Diploma on accounting and finance. There are lots of college which provide this course.

Dear Karan,
Please keep your career in mind. NIIT is offering that course as a commercial base. Therefore, focus only on the best business schools in the country for your management programme. Don't experiment.
All the best.