Chad's Coursesaver videos are not adequate for biology. I recommend using Cliff's Notes + Ferralis Biology notes. These two will help you get a good score. Good luck!
I recommend Crash Course on YT when you get to the physiology sections (muscle, endocrine, nervous, etc.) Breaks each system down simply and has more in-depth videos on each system if the overview one isn't enough. Really helpful when trying to learn the sections vs reading long paragraphs and passages about each step
