Hello utkarsh

Actually AIEEE entrance exam is No more in present and AIEEE was replaced by JEE MAINS in 2013. so, both AIEEE and Jee mains are same thing.

By April 2013 , AIEEE was effectively renamed to JEE Main, and IIT-JEE was renamed to JEE Advanced so as to maintain a better, simpler consistency between them. Today, any candidate who is interested in joining NITs and IIITs must take up JEE Main, and anyone who wishes to join IITs must complete their JEE Advanced.

Thanks