I need a pre-built JavaFX app modified

I think you aresomeone who is very good at programming Java, has experience with coding JavaFX programs as well as using SceneBuilder. I and others have built a basic quiz program/game where users/players have the ability to select genres of questions and can answer them. It has difficulty levels and also hints and jokers, kind of like "who wants to be a millionaire".

I need scenes and windows added as well as some designs. I will send all the necessary details as well as the codes and everything else. However, I don't have much time, so it has to be finished in less than a days at the latest. Can you do it?