When I first took calculus, it was a bit of a struggle. I was too slow in understanding the concepts and solving the problems. Consequently, I failed all the tests. I checked afterwards what I did wrong and understood. But that was after the fact. It was all well and good that I understood, but I couldn't pass the class that way.
That's about how my life is feeling right now. I understand the mistakes I made in the past. But it doesn't really help me now.