Hey Navya,
BCA or Bachelor of Computer Applications is three year full time three year course. People who want to build their career or know about computers and its applications can opt for this course.
Lucknow university also provide this undergraduate course.
Minimum Eligiblity:- 10+2 with 50% marks (45% for reserved categories) with Mathematics as one of the main subjects.

Yes, there is University based Entrance exam Followed by Councelling.

How to apply online :-
1. First, Click on its official website and Application form 2019
2. Click on the course you want to opt for and fill the general details of yours.
3. Pay the fees  via online mode.