The Piscine is designed in a way that both the candidate and 42KL can validate if this educational model is the right fit. If a candidate is not accepted into 42KL after the Piscine, we advise them to try a different learning program. This is not the only way to learn to code!
Having said that, you are still allowed to try out the Piscine again one year after the first trial. You can make a maximum of two attempts in your lifetime.