I never thought cheating in exams was that enjoyable, having loads of fun! I originally was going to complain that you need to memorise or try-and-error everything, but got smashed when you put in the two ingredients potions. Kudos for having a nice way of telling the player what should be done instead of saying it directly.
I felt like if the teacher faking some actions to catch out the player, or other distractions in-game to make reading cheatsheets more difficult would be a nice way to add to the mechanics. But the game as-is is already well done and polished. Hey, how can you argue with a game thats accompanied by such nice art? Good job!!