In the past, learners who were new to Khan Academy completed an eight-question pretest called “Getting to know you.” However, because this pretest was so short and could be taken only once, it provided limited information about learners’ knowledge.
To get a more complete picture of learners’ knowledge, we have integrated questions from the former pretest into challenges. (Your first challenge may be called a “mission warm-up.”) That way, we can get information about a learner's knowledge state on an ongoing basis.
If you are a learner, completing mastery challenges will help you accelerate through your mission at a faster rate.
If you are a teacher, you can find guidance for choosing a mission for your class here.