Badri

It normally asks 2nd time to conform so everyone should probably be careful when you get 2ND ALERT and you cant recover your account  

1. Comunidad
2. General Khan Academy Questions
3. accounts.....

That is the max mastery skills you need I think, I'm not sure but 450 mastery skill is too much and it's hard to get

1. Comunidad
2. Content Requests and Feedback
3. New badges