Courses related to business management after b.com with 40%?
If u regular bcom then u should try in Private College which is accepting bcom graduate for Management course.
U had a option of other courses like CA,CS & ICW.
They don't required bcom .
Eligibility for CA is HSC or 10+2 But Entrance Exam is mandatory for CA Course.
But ICW & CS will be easy for graduate student coz they don't required Entrance Exam.
Thanks,
Azim

Sorry to say but with this less percentage its very tuff for you to get admission in any management college. You should have at least 50% marks to do any course.This score of yours is extremely low and hardly there is chance for you to get in any B school.
I hope this helps.