Interactive answer sheet
I have personally identified 50 points you need to know in Mathematics 3 for when you are about 75% through the course.
And then I have given examples of those things at a basic level and at a more in-depth level.
And instead of making a static answer key for it myself, I asked Google AI Studio to produce both an interactive and a static answer key. In the interactive answer key, I asked that you should be able to enter your answer, have it checked by the AI, and also be able to chat with the AI about your answer, and alternatively just see what the solution is and have the solution explained to you step by step—either just in brief bullet points or with more text if you prefer that. It was very good except that you needed to correct that darn answer key a lot. So my students who were the first to get into it were furious with it because it was wrong all the time. Once you have corrected all the errors, it became a fantastically good tool though!