Stick with racing until it’s not profitable - there’s no rush in going to school now if you didn’t already. Just don’t paint yourself into a corner / get into debt and end up owing the “company store” re: that racing.
As far as degrees. Unless you’re going to somewhere big/respected, skip the business/marketing - that will only carry weight depending on where it’s from - you’d be better off taking an unpaid internship with a marketing firm if that’s what you REALLY want to do.
I do however think it would be wise to take some continuing ed stuff and work TOWARD an eventual degree, at the very least getting the “Basics” out of the way - JUST BE CAREFUL because credits expire, don’t always transfer, are time dependent re: relevancy etc so base that decision based on where you want to be working/studying/etc in say 5 years.