How can I make myself stand out tomorrow?

I'm riding tomorrow and all the ponies that I ride are really slow and frisky and bite all the time which are about 14hh and theres one horse they put me on some times that way too big (about 17hh) and is so bumpy and I really struggle to stay on when I canter on him and my mum sees me ride every time and I'm not a nervous rider, I'm quite confident at it because I've ridden 7 years. My dad's coming to watch tomorrow too and I have to show him how much I've improved and that I'm not nervous at all anymore because I used to be kind of nervous because I fell off all the time and didn't like whipping them because the ponys that I ride buck when you whip them. But now I don't really care and the other week I whipped this pony that was going soooooooo slow and I needed to get her to go faster to get a good canter because we were jumping and she bucked her legs up soo high and I was 1 handed, and flew forwards but stayed on and just rode round like nothing ever happened and it resulted in my riding teacher having to tell me to slow down the slowest pony in the yard because I got her going so fast :) And I galloped along a beach in africa once. How can I make myself really confident at it tomorrow because if my dad sees how good I am with the ponies now my family's going to think about getting one in a few months... And we were hacking round the local village and there was a big horse infront of me that just kicked off every now and then and about 2 years ago I'd of been crying and shaking because I was scared that because the pony i ride was prone to bucking people off that Id get thrown but I just ignored it and pulled my pony away so she didnt get kicked and carried on riding. So for tomorrow I need to look really good. Please help. Thanks :)