I've only ever failed Geometry in 10th grade. We have State Regents Exams in NY, which are the actual important tests. I had a 75 in the class (that's a C for those that don't use numbers) all year and he was prepping, explaining, and hammering into our heads "REGENTS REGENTS REGENTS".
..Well, the regents Math A exam was easy, I got a 90%. However, he of course failed to mention until the week before we'd be having a regular final in addition, which was ten times harder and just geometry, unlike the Regents which was Algebra/Geo mixed. I got like...I don't even know, a 32%? Eight kids out of twenty in our class failed, the rest got C's except for one girl. Nice preparation, teach.
Haha, I'm not entirely blaming him, but really, one week before a giant test like that? Review sheets much? I went to the worst two months of my life (summer school), aced it, and went on with Junior year, but really..bleh. Otherwise, my normal HS grades we're always Bs and As except Pre-Calculus.