Its an exam taking place at National level for getting admission into under graduation courses into aircraft maintenance engineering. Your rank category  comes under ALL INDIA QUOTA ranking.

Some of the top colleges through AMU CET are as follows -

1. HCAT Kaniyakumari
2. Alpine Institute of Aeronautics, Dehradun
3. Bharat Institute of Aeronautics, Patna
4. Hindustan Institute of Engineering Technology, Chennai
5. Indira Institute of Aeronatics, Pune

Refer to the website below for more detailed information..

https://www.amecet.in/

Best wishes. Thank you.