IT field is mainly considered as private sector.You are eligible for jobs in many IT companies.
10.Satyam and many more.
However,since you are a BCom graduate,
You can go for exams conducted by Staff Selection Commission and Union Public Service Commission.
Positions such as accountants, tax assistants, and administrators are open for you.
You can apply and appear for all bank jobs.
You also have the eligibility to appear for civil services exams.
You can enter into defence sectors as accountants and also officers through entrance exams .
Railways have lot of opportunities for B.Com graduates.
For applying in the Indian Post Office, you should have passed the degree with 60% of marks.
After giving the competitive exams, you may be posted as :-
Chief Account Officer
Upper Divisional Clerk