AMECET is a national level entrance examination for admission into under graduate and post graduate courses in the field of Aeronautical and Airspace maintenance Engineering. Its not a bad career, if youexcel well in a good college, then surely you can get decent placements. The reason people might be saying bad is maybe because through JEE you can get into the same field into IITs and NITs which obviously have better placement opportunities comparatively.

This is a list of colleges accepting AMECET scores.... https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-india-accepting-ap-eamcet

Below is the link to know more about the AMECET entrance examination..

https://www.amecet.in/aircraft-maintenance-engineering-common-entrance-test-amecet-exam.php

Best wishes. Thank you.