I'm a junior in high school and among other advanced courses Im taking AP Chemistry 2 which is by far the hardest. Now I've had difficult classes before but I have a good work ethic and am able to work through them no matter how hard and come out with an A. While I still have an A in chem as well it is frustrating me to no end. Our teacher just flies through subjects at the speed of light and while I feel like I comprehend what's going on, when tests roll around I do relatively poorly consistently despite studying. Because of the time issue i have no time to go back and fully understand what I'm missing which leads me to the most annoying part that is I don't even know what it is that I don't know if that makes sense. I'm excelling at all other courses but this. Hoping to pursue a scientific future, does this mean I'm screwed or could this just be a one time thing?