I don't think it's correct. You had better say You got it wrong this time, but next time you'll know. I hope this does make sense.
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AnonymousYou got it wrong this time but you'll know for next time.It's fine. Ths idea is that you will have the knowledge when/if you are confronted with a similar situation in the future.
Nugso Shouldn't we omit for?No. We can if we wish, but we don't have to.
NugsoI mean does this sentence make sense without for?Yes. The meanings of the utterances with and without 'for' are slightly different, but both utterances are acceptable in Britsh English. I can't speak for American English.