Hello Rahul,
Here are some courses you can after B.com with less than 60% marks secured.
1) Business Correspondent Courses
2) Post Graduate Diploma in Banking(PGDB)
3) Certified Bank Manager Program
4) Diploma in Banking and Financial Services
5) Association of Chartered Certified Accountant(ACCA)
6) Business Accounting and Taxation
7) Cost Accounting
8) Risk and Insurance Management 
9) Financial Modeling 
10) Financial Risk Management
Hope this information is helpful!!!