Diploma

Chakradhar, you definitely can pursue B.Tech Aeronautical engineering. You have to apply for B.Tech Lateral Entry. Some like IITs, IIITs have entrance test for lateral entry in B.Tech and private universities like Lovely, Chitkara, etc offer direct admissions on basis of marks in Diploma.
Most of the universities these days are a hub of quality education and good placements. Some of them also offer good scholarships.
Check their websites for more information.
Best wishes.

Of course, you can take admission in any government college for a Diploma in automobile.

Hi Pratik,
Different colleges have different requirements. For Diploma programs 50% is required by majority of the institutes.