Hello student B.tech engineering In aerospace is one of the best branch. To get admission in to top colleges such as IIT NIT IIIT,you need to appear in jee main examination. Jee main is a national level entrance examination for admission into B.tech BE AND B.ARCH jee main is conducted by NTA (National testing agency) 2times every year one in January and another in April. If you want to appear in jee main April examination you need to appear for it. Application start from 07th of February and shall remain open till 07th of March 2020.

Eligibility for jee main. Candidates must passed class 12 with physics chemistry and mathematics with minimum 75 percent marks from a recognized board.

Appearing candidate are also eligible for jee main.

For more updates click on the link mentioned below
https://engineering.careers360.com/exams/jee-main

Apart from jee main your can also apply for entrance examination mentioned below
1)BITSAT
2)MET
3)SRMJEE
4)VITEEE

Feel free to comment if you have any doubt
Good luck