Hello Monishwaran,
As I can see you can to change the track from Mechanical Engineering to BCA and after 10th yo u have enrolled for diploma . Sorry to say but unfortunately you cannt change your background from Diploma in Mechanical Engineering to BCA, because for taking admission in BCA you need to be eligible. For taking admission in BCA you need to completed 10+2 in any stream from any recognized board, that is the basic eligibility criteria, it varies according to the colleges.
I hope this information will be useful for you.
If you any have query please don't hesitate to drop message in the comment section below.
All the best!
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