Hello Khan Academy!
I have enjoyed using your site to study for the SAT, and I appreciate all that you do! I would like to make a suggestion for the practice tests. When I took the practice tests, I would always look back through the wrong answers and write down what type of problems I missed so I could study those more. I think it would be very helpful if you could create an "extra work required" section in the daily studying that combines all of the problems missed on the practice tests.