Mastery Challenges

The Mastery Challenges in Khan Academy are very helpful because if a person get proficiency on a skill they can just do a mastery challenge to make it mastered. But the mastery challenge only increases the skill area the person has done. Instead of this Khan Academy should make the Mastery Challenges 1 question from every chapter. This would also help people level up faster and see where they are lacking and where their strengths are. Another feature Khan Academy should make about the Mastery Challenges is making 5 or 3 skills to have a Mastery Challenge within 30 minutes.