If it's what you really want, just try your best doing it. It's great how you you're confident in yourself and what you're doing, and I think it adds more to your success's percentage. And when you're going to do something such important to you, it's natural to have fear of failing. So don't be worried much about it. I think you should concentrate on your strong point, it'd help both your feeling to be better and your application or interview too.
Good luck! I'll cross my fingers for you get into that school ^^