Diploma

Yes, there are chances, you may get admission there.

Yes, you can do this course as you are eligible for the same.

You can apply for following courses:-
1) B.Sc. In Electronics
2) B.Sc. In Physics
3) B.Sc. In Mathematics
4) BCS
5) BCA

Yes, you can do Diploma as a mechanical draftsman.

You can check the following link to see the list of colleges. https://www.shiksha.com/engineering/colleges/aircraft-maintenance-engineering-colleges-tamil-nadu

Hello,
As you have completed your Diploma in Electrical & Electronic engineering, you can apply for BE in Electronics Engineering.

Hello,
It is not possible to pursue MBA after completing Diploma in Electronics & Communication. To pursue MBA, basic eligibility criteria for MBA is that, candidate have to qualify Bachelor's degree with at least 55 percentage.