How do you become proficient in an exercise on khan academy?

To become proficient in an exercise on Khan Academy, start by carefully reading the instructions and watching any related instructional videos. Attempt the exercise, and if you encounter difficulties, review the hints and explanations provided. Practice similar problems to reinforce your understanding, and continue revisiting the exercise until you achieve a mastery level, typically indicated by a percentage proficiency score. Regular practice and engaging with additional resources can further enhance your skills.