I have been testing it for the last 10 mins or so, I really like it so far, I am reviewing algebra just as something super simple. It asks you to add your understanding of the concept, ie explain why you can always group a polynomial after splitting the middle term. This is honestly more than I got in my mediocre public school. I could see kids getting a lot out of it especially if their parents aren’t very knowledgeable or cannot afford tutors. Not probably a huge improvement on existing tools like kahn academy though. I will continue to test on more advanced subjects.