Your total score depends on the submitted solution *and* the Part III
test. Although Part III is not evaluated separately, I believe the evaluators will attempt to correlate your answers for Part III with the solution you submitted. If it is only one question you answered incorrectly, I don't think they will fail you. It might reflect on the scores. But hey, at the end it is the certification that matters. I haven't had too many people ask me what my scores were! So don't worry!