This deserves so much upvote! There's no comparable ressource out there, so I would totally support that Khan should grow to college mathematics that is necessary for engineering and science :)

I fully agree to Simons reasoning. Thanks for that post.

How well does this fit with the need you describe?

https://www.khanacademy.org/math/multivariable-calculus

Rasmus Hertzum, thanks for taking the time to answer. It sounds like the original poster is aware of the page for which you have provided a link. Some of these courses do indeed exist on Khan Academy, but they don’t have much, if at all, in the way of practice exercises, unit quizzes, unit tests, and missions. I join with the original poster, Simon, in requesting more ways to measure how I am doing with these courses, once I start studying them. Multivariable calculus does have two (yes TWO) practice exercises but none of the other types of tests.

Admiral Betasin, An0nym0us (apology in advance for any mistyping of this name) ,and the others who respond that the Khan Academy staff is busy concentrating on K-12 topics, your point is taken, so you don’t have to respond to this.

You are right. The advanced math sections are definitely lacking in exercises. I hope that this will soon be prioritized. 

Love this. More practice problems for college math courses would be amazing. Additional college level math courses would also be much appreciated.

I second this request.

I third(?) this request

Fully agree :D