Raqioth A'tlasyphoros Triabyssios

1. Cộng đồng
2. General Khan Academy Questions
3. Badge Tiers

That's nice! :]

1. Cộng đồng
2. General Khan Academy Questions
3. Mastery of classes?

You have to do Course Challenges, Unity Tests or Mastery Challenges

1. Cộng đồng
2. General Khan Academy Questions
3. Badge Tiers

Hey! Challenge patches are specific to the course content, they do not follow the normal level from most common to rarest, which are: Meteor, Moon, Earth, Sun and Black Hole respectively.

1. Cộng đồng
2. Study Group
3. Learning Routes

Now you have to Master Arithmetic and then Basic Geometry

1. Cộng đồng
2. News and Updates from Khan Academy
3. Content update: Brand new high school physics and biology courses are here!

Thank you guys very much