Best educational online resources for Pre-med courses

I searched for a post with a list of online resources but i couldn’t find any. I thought i start one. Please share the links of all the online resources that was/is helpful with your pre-med classes. You can also share a link to a book or video that you used that was/is very helpful.

Please use the following format to share:

For example,

Course(s): General Chemistry 1 and Physics 1


Thanks a bunch!

All sciences:

Website: Freelance teacher at

Organic Chemistry I: Organic chemistry book that helped tons (not an online resource, but still helpful):

“Organic Chemistry as a Second Language” by David Klein, 1st semester topics was more useful than the 2nd semester topics, but both helped me tremendously roductCd…

Organic Chemistry-practice problems