A. You are from science stream with JEE Mains. If finance is the only issue, you can try for a bank loan or approach one of the NGO like organisations.
1.For instance, the SSAN ANNANYA trust in Chennai has a mission statement that education should not be deprived for lack of finance for deserving candidates.
Room No 25, 2nd Floor, IC&SR Building
Indian Institute of Technology Madras,
3. Mahindra also gives scholarships (https://www.kcmet.org/what-we-do-Scholarship-Grants.aspx)
You need to check similar trusts that can help you.
B. As for as the detailed description of subjects in B.Com goes, it changes based on the year.
Compulsory Subjects-English(functional,Additional),Financial Accounting,Buissness Economics (Micro), Maths & Stats or Computer concepts & Programming
Optional Subjects- Banking & Finance, Office Management, Marketing & Salesmanship
Compulsory Subjects- Corporate Accounting, Business Communication, Business management, Business economics(macro), Corporate Law, Environmental Awareness
Optional Subjects- Marketing Management, Business Administration, Banking and finance
Compulsory Subjects- Advanced Accounting,Business Regulatory & Framework, International Economics,Auditing & Taxation
Optional Subjects - Marketing Management, Business Administration, Banking and finance
if you are choosing to go down the B.Com route, please analyse your core strengths, your aptitude for numbers, logical reasoning etc, then choose the subjects that you can excel in.
Banking, finance, accounting, computers will help you to have scope to apply for a government job after B.com with the essential qualification exams or even to broaden your horizon further. Corporate law, international economcis and wealth management you give you an exposure to apply for an intership in banks/fund houses/wealth management firms etc. You can work on it in the final year and then settle down in a good career.