Will you please tell me whether I am eligible for Chartered Accountant after DCP and B.Com???

Yes you are eligible for Chartered Accountant after completion of DCP and B.Com CA as minimum requirement for CA is 12th std.

Chartered Accountancy course has three stage

CPT
IPCC
FINAL

CPT --
-The minimum qualification required to enroll for CPT is 10th pass but, you may appear for CPT exam only once you complete your higher secondary 12th.
-For becoming charted accountant you must write the CA CPT exam which is a common proficiency test.
-The eligibility needed for the exam is that the candidate must have finished his/her respected +2 from a recognized board.

IPCC ---
-The minimum eligibility for enrolling in IPCC programme in either CPT passed or graduation passed from a recognized university.
-Students who have completed their graduation gets exemption from first stage CPT.
-Since, you have completed your graduation you also becomes eligible for exemption and you may apply directly for IPCC programme.

Final Course –
- It is a final stage of theoretical training

Besides these the student or trainee has to undergo articleship for a small period usually (3 years ) in reputed firm which will be considered as practical training