I liked the game even if I didn't understand the scoring system! and the choice of cards was logical, I think.
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The students' grades acted as a time modifier, adding or subtracting to the cards you play. The better their grade in a subject, the less effective a card in that subject would be, and vice versa. It's kind of counterintuitive, and definitely could have been shown better on screen. Glad you liked it anyway, thanks for your comment :D