There are various short term courses with guaranteed placements assistance. Sone of them are kisted bekow for location across India.

https://aviationspaceindia.com/certificate/A%20M%20E%20Avionics?page=1

Some of best courses include Aircraft Maintenance engineering and Pilot Training.

Theseboth have immense scope and good amount of opportunity, salary paid to both above profiles are handsome and has good demand across Aviation industry.