Help with job interview? :D?

I have a job interview at Taco Bell on Friday, it will be my 3rd job interview, and my 1st REAL job, the other two were scams. I'm 17, and i REALLY need the money, for a car and college. Id love to work at taco bell, anyone have any tips on how to get the job no problem? Or does anyone know what questions they ask? How do i answer questions like: whats your greatest strength and weakness? PLEASE HELP <3