I like this a lot, except I'd be cautious about using "good" there. I know some anxious students who would feel like they were automatically bad at math because they couldn't do all that yet. Maybe "I have mastered the math concept when.
Middle School Math Man: Angles, Triangles, and the Start of Geometry in Grade Math!
First Day of School activity: Questions and "sticky" answers: What will you need to do to be successful this year? What will you [the teacher] need to do to help you be successful this year? What do you expect to learn this year in X grade? What should st