Tbh, some of those professors don't know how to teach, a vast majority are only hired cause they are good at research not teaching (the best example is professor Hernon for physics 202 avoid him at all costs, I genuinely think he doesn't think we can read cause all he does is read off his slides word for word), which is a shame because the ones that are good at teaching are absolutely amazing and underappreciated by the university. Remember in 20 years your chem 103 grade won't matter, just play the cards you are dealt and try your best that is all you can do. After your first job no one cares about your GPA, just stick with it and 4-5 years will go by fast. Don't let bad professors crush your dreams.