Pretty fucking easy. The thing with the job market is experience > education.
You can have all the education in the world. Could be a fucking doctor, but somebody who has a few years of experience in that field and solid references has a better chance than you. Obviously depends on what kind of job but experience is huge.
Don't burn your bridges. IF you have a job, even a shitty job, work your ass off. Try to move up the ranks. If you want to move on work to leave on good terms. You'll want those good references when applying for a job later. If you and a few other people are basically even for a job, when they call your references and they all say "great guy, very hard worker, left on good terms" you're going to be looking a ton better than having them call your employer and find out you were late all the time, sucked at your job, and quit without notice.
Not making it out of highschool is dumb though. I figure You can't quit until right at the end of highschool, you've slaved for 11 or 12 years to get to that point, why quit with a year to go.
But it really doesn't matter that much. People who set goals, and work there asses off to get there are the people that are gonna be alright.