Generally speaking, our courses are designed to make math, science, and computer science fun and interactive for people ages 10 to 110. That said, we do require you to be 13 or older in order to have your own account.
Other then that, our math curriculum goes all the way from Pre-Algebra up through Calculus and beyond, so any level you might be looking for between the two is covered. We even have a number of college-level courses, including Vector Calculus, Group Theory, and Gravitational Physics.
We're also adding more courses all the time, so if you're not seeing the subject you want to learn, be sure to check back regularly, and if you'd like to let our instructors know about a topic you'd like them to consider, you can let them know about it here 🙂