Hey,

Firstly there ia no BCA in AMU or DU. Both offers BSc in Computer Science which is pretty much similar to that. There is an entrance for that in AMU. The forms for AMU will be out by April/August not sure yet. You can visit the link below for details regarding the admission in AMU-

https://university.careers360.com/articles/amu-admission

Whereas in DU you need to score well in your boards since the admission is merit based. The forms for DU will come out once your boards result are out. Probably in the month of July/August.

I hope this helps.