Why does a 13 year old need 600$? If it was me I would get your lawn mower with a few buddies and go mow lawns. Or maybe go to your local store and put shopping carts away for tips. (When i was 10-13 years old I made about 25$ in about three days with all my friends) Good Luck!
Utilize your interests/talents in the services you provide. In this way, it won't seem like work. Emphasize quality of service, and the money will arrive on schedule. Networking among your perspective "clients" will blossom as you extend good will and quality of workmanship. Good luck.