How to prepare?

Guys I'm a non maths student and prepare for nda l 2027. There is a lots of coachings and books in online platform, so I get confused which one is useful for me. I completed my 10+2 last year and I'm a female candidate.

So you can help me to find-

1. Best yt channel for nda perp.

2. Best books for both written and ssb.

3. Teacher for esp maths and gat also.

4. Is gopal verma sir good for beginners english? I purchased his book vocab wits.and

5. How many pyqs i should have to do everyday?

Due to some reasons i can't purchase paid batches. If you can give me any advice then plz, in this post or you can DM also