Images having a required score makes tracing less of a pain, the highest would be 90 on brainiac during late-game. Still though...fair point.
Another art notebook idea would be producing one color between two other colors, involves typing amounts of RGB in little boxes. You would be given a preview of that color before submitting. Went for drawing instead as it felt unique compared to my Geometry and Biology notebooks.
Your PE teacher idea sounds interesting, running till you reach a miles-worth instead of PE notebooks, makes edibles really valuable. Hitting the coach with dodgeballs would feel satisfying. Also, maybe solving math notebooks gives player additional stamina items?