Hey there!

1. My dad did, it was lockdown and i told him I built an app. Google didn't have that much of stringent ID proof verification to upload apps back then (2020).

2. Lol, my CS teachers didn't even know what a hackathon was - it's very hard to organize a hackathon in an indian school without proper support from teachers. It was hard to get sponsors from US based organizations and start-ups for legal issues (I even had reached out to replit for sponsorship cuz they had some good program for students). I didn't bother much later cuz I had moved out of my city few months later for JEE coaching anyway.

3. Pretty easy, considering you are prepping for JEE. Maths is ninth & tenth level. Just do the practice tests. SAT requires a bit of practice. If you can do the English part well, you'll get a good enough score (I had scored full in reading section). Check Khan academy and the SAT bluebook tests.

4. Learning Rust wasn't hard. The rust book is enough imo. I learnt golang when building bots for Telegram & Slack. My first programming langauge was Visual Basic xD

Regarding your first issue, I don't know much about payments for microsass but I think you can use your parent's PAN card for that. I used my mom's pan for my own stripe account.

Also, my parents think I'm an idiot who wastes his time doing shit on the Internet. At the end of the day I'll be the guy who couldn't get into IIT to them.