These are some web sites and YouTube channel that might help you when the professor isn’t available for help.(please add more under this post, in the comment section,if you have other websites or YouTube channel, that could be useful.
Khan academy (website and YouTube)
Patrick jmt (YouTube channel)
sparknotes(website, search “calculus ab”)
Thanks for sharing, Kevin. I’ve added the category “Discussion” to your post so that it appears under the “Discussion” tab.