Highschool is hard? Are you kidding me?
It's hard if you're braindead, or if you're chronically truant. If you come to school regularly and do a reasonable job of doing your work, it's just a 4 year vacation with reading breaks.
And if it wasn't for the free access to drugs, alcohol, and the lax approach to attendance, college would just be an extension of that vacation.
You want hard? Go to Medical School or, to a lesser degree, Law School.
If you can't handle 9th grade, be it due to ADD, lack of discipline, or plain and simple stupidity, you're in bad shape.