the 'tu' form of ganar in the subjunctive is gana not ganes. It is only ganes in the negative.
This is the sentence you are referring to from the quiz:
Espero que ganes mucho dinero en el Euromillón.
I hope that you win a lot of money with Euromillions.
This form of the verb ganar "ganes" is the present subjunctive, not the imperative, and "gana" is the affirmative imperative form.
¡Gana mucho dinero! = Win lots of money! (imperative affirmative)
¡No ganes mucho dinero! = Don't win lots of money! (imperative negative that takes the form of the present subjunctive: gane, ganes, gane, ganemos, ganéis, ganen
I hope this clarified it.
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