What are my setbacks in life?

One of my setbacks are me not passing my math class. Its not that hard but it is difficult to get. I always mess up on a step so I get it incorrect and then they add up and I end up failing. So every time we take a test I always tell myself I can do it and try my best to past because I really want don't want to fail and have to take it again. So at this moment I'm just trying my best and having a positive attitude.