If you really plan on trying to ride it to school and back on a daily basis, get yourself a mini bike. It's going to be illegal on public streets but no more so than a riding mower. It will also be a lot faster and a lot more dependable. You will also look a lot less stupid not being on a lawnmower. In reality 18 isn't that far into the future ( although at 15 it seems like it ) walk to school, work your a$$ off, and save your money so you can buy that Chevelle, or Mustang or Nova or whatever it is that fires your rocket. Go karts are kool, but as you transition into young adulthood your own ride is going to become pretty important.