A YR 12 graduation is a significant event………………………….at this time. When you look back on it years down track, yes it will have some relevance but not as much as it has now. You are looking at starting your career and not just at a car wash. Number of things to consider, from are you happy to delay you application 12 months, are you able to accept foregoing the grad but not be successful at FSP??
There are applicants that miss their grad, do not do schoolies to attend FSP. Only you can make the decision.