Taking a class twice teaches a skill nobody brags about: walking back into the room where you failed.

The hard part is almost never the material the second time around. It is the ten seconds at the door, the walk to a seat, the certainty that everybody in there knows this is your second go. That is a different skill from studying, and once you have it, it works on every room you ever have to re-enter.

Name the door as the hard bit so it stops ambushing you. Get there early, before the room fills, and sit near the front, away from your old seat. After about three days nobody is thinking about it except you.