Diploma

Fees varies from college to college, please specify the college, so that I can help you.

There are 80% chances that you can get admission here. Your percentage is good so, you can apply for admission.
Good luck.

No, it is not equivalent to class 12th exam.

No, you can't take admission in any PG course or Diploma if you haven't cleared your Bachelors degree with an aggregate marks of 50%.

It is very nice to hear from you that you are interested in doing your graduation in engineering in aeronautical engineering branch after completion of your Diploma in mechanical engineering. Yes, you can definitely and surely dream of this. For admission in IIT's, you need to score 75% in Diploma a

Hi,
Yes, you can take admission in 2nd year, as you've done your full schooling, so it will be easy for you to get into it.

Yes, you can get admission in BA (music) after Diploma in computer, as the eligibility criteria says that the candidate must be class 12th grade passed with an aggregate marks of 50%.

Normally, the cut-offs for colleges affiliated to Pune University for entry through diploma range from 80-90+%. You can try inquiring to college authorities for further information.