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Question

the 'tu' form of ganar in the subjunctive is gana not ganes.  It is only ganes in the negative.

Inma Sánchez · Answer

Hola Elvira
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.
Saludos
Inma