Organized by subject, by topic, with videos/whiteboards for each piece.
IMO, there's nothing better on the internet for a quick review or get-up-to-speed than Khan. All free, too!
PS: I have a Rice student with me today as our EMT student. They have that option (EMT/Paramedic course) as part of their pre-med track. Generally they're either really good students, clinically, or really bad (meaning they're smart, but destined for an MD+PhD route and research vs. patient care).