Hello,

Unacademy is a study platform which is basically for online study. They will give you lecture by your preference. You can ask your question there.

Unacademy give you the lecture videos, PDFs. So if you really want to going on a serious preparation for NDA examination then you can trust unacademy. So many online study platform is not so worthy but this is good.

You can practice here without taking any offline coaching advice. You can prepare yourself from your home and ownself.

All the best.