caranthir: If you mean the same thing as ulty4life: J1 is sente but does not gain points. We can play those (and other 0 point moves) in any order after playing all the more than 0 point moves. These problems don't care about 0 point moves. In a general case those should be played last; even the sente ones because those should be saved as ko threats (albeit, admittedly, in this particular problem it doesn't make a difference because there aren't any kos on the board. Anyway, the best is to unlearn a wrong habit right from start).
If you mean the same thing as ulty4life: J1 is sente but does not gain points. We can play those (and other 0 point moves) in any order after playing all the more than 0 point moves. These problems don't care about 0 point moves. In a general case those should be played last; even the sente ones because those should be saved as ko threats (albeit, admittedly, in this particular problem it doesn't make a difference because there aren't any kos on the board. Anyway, the best is to unlearn a wrong habit right from start).