Downpayment on my 1st car!

I'm trying to raise money for my first car. I know I'm only 15, but I got a job at age 14 and already have my beginners license. I also have had straight A's all my life, if that means anything. Because of that, I also happened to get a college scholarship in 8th grade. We found a good deal on a car, and I'm trying to raise at least enough money to get the guy to hold it until my CD check is able to be cashed so I can pay for the rest on my own!! Anything would help!