I'm getting stabbed tomorrow what do I do?

What that 12 grader and 9 grader were doing is felony and most likely will have a permanent record. If he is going to stab you call police and possible the FBI for witness protection. I would also have the law arrest both the 9th grader and 12th grader and charge them with aggravated assault and attempted murder. If it were me, I'd play the right-wing group and have them both executed by firing squad!