Free AP Test Prep Courses?

Has anyone else seen the ‘high school initiative’ courses on edX? They are exactly what they sound like; a ‘course’ made specifically for high schoolers taking AP exams, made by the top colleges who can actually afford putting their courses for free online or random, unheard of places. Some are Rice for Env Sci, UC Berkeley for Comp Sci, MIT for Calc, etc., plus the Tennesse Board of Regents and Cooper Union (?) for Chem.

What do you guys think of them? Are they worth taking? What about for self-studiers?

There’s also several courses on Coursera for Physics 1, Calculus, and Stat.

I just finished 9th grade with two completed edX courses. I have fell in love with edX and do plan on taking advantage of their AP prep especially since my school does not offer any AP classes. I choose edX over Coursera because edX gives you a free certificate if you finish a course :stuck_out_tongue: