Answer 1

So here's what I did.
It's not very good because of hardcoding and displaying text made me some troubles, but it's a good place to start.
https://code.sololearn.com/c8o1oBgHxDwU/?ref=app

Answer 2

I don't quite understand your problem but I would like to help you.
Can you please explain it a bit more detailed?

Answer 3

So all you need is decrease or increase points when buttons are clicked?