Diploma

jee is for getting admission in btec/BE courses not for diploma courses

Yes u can do Comp Sci Engg after ur diploma
Also u can take direct admission in B.tech 2nd year through lateral entry.

You can seek lateral entry in the second year of B.Tech aeronautical engineering after Diploma in mechanical engineering. Different Engineering colleges have their own process for lateral entry admission. You may evaluate Manipal Institute of Technology.

MSME-Tool Room, Hyderabad (Central Institute of Tool Design) runs some job oriented short term courses. You can select one of the courses from them which you find better. Their website is:- http://www.citdindia.org You can also search IGNOU for certificate courses. If you want to be an entreprene

Pursuing MBA is surely a good option as job opportunities are many after the same. Instead of Dilpoma, invest in good MBA program which will give you a leverage of Post graduate degree for further education. Pune, Mumbai are good options for pursuing MBA/MMS.

Hi Nikhil,
By PPT exam are you mentioning the Pre-Polytechnic Test (PPT), well the exam is conducted for ever state. Before giving away any particular details, it would be great if you could mention the course that you are keen to pursue and also your education qualification till date.
All the Best!