You just brought back a flood of memories! I also had to take some courses that I had a lot of trouble with and never had to use in my nursing career. But I don't regret any of them. They stretched my mind!!
The only thing that helped me was an excellent professor, actually more than one. I found the teachers made all the difference, at least to me. Also study groups- those were the best!
I know it's hard when you're in the thick of it but someday you'll realize you know a lot more things than you ever realized!! :D
Good luck :)