I had an okay teacher followed by a horrendous student teacher for 2 months and then we went back to our normal teacher (who seemed tons better after the idiotic student teacher). But my friend and I figured out that we can't rely on the teachers to get us through the course. If we have a problem, it was our responsibility to solve it for ourselves or ask for help. And so throughout April, we studied extremely hard for the exam, staying after school, doing tons of practice problems, reviewing everything, asking lots of questions. And it paid off for me - I got a 5, and I was so overjoyed that all my studying helped me get that score.