I'm glad you are enjoying the videos and extra knowledge is always useful. However....be sure that you don't lose focus on your coding studies. Pharmacology, anatomy and pathophysiology are important but your coding studies are more important.
One of the best things you can do is done while coding. When you come across something that you don't understand stop what you are doing and look it up. This could be a word you don't know the meaning of, a body part you don't know or a procedure you are unfamiliar with.
The text books you are using are the top books in the industry and combined with a bit of internet research are all you need to learn to code and pass the certification exams.