If you have a choice, there are certain types of subjects that do not translate well online.
Do you have a local community college that would allow you to use their resources? I.e. the one I go to has a model room with models of the skeleton, muscles, nerves, etc. that you can pick up, touch, feel, move around to help with learning.
If you have access to other books, use them. For the skeleton, I was using the class text book but also Mader's Human Anatomy and Netter's Atlas of Human Anatomy.
I took this course online. I found the ap coloring book a great resource. It helps to find out what kind of learner u are. Do you learn best visual? Than use the coloring book. Or audio? There are great YouTube videos out there. Ask your teacher for additional resources before you get to far behind. I took all my pre reqs online when I could because I was still working a 9 to 5 and could not make it to campus during tutorial lab hours. I had to make it work with what I had at my finger tips.