If you want to practice Ochem there are a couple of courses on here using mastery learning, the following includes all Ochem practice material on this site: Khan Academy | Khan Academy Khan Academ...

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3. Review for Organic Chemistry

Do Calculus 3

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Already done 30% in the course and so far it's really great! 

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3. Content update: Introducing Khan Academy’s Middle School Chemistry course!

It seems Khan Academy is finally getting a Physics C course. :) Hopefully they'll start launching it throughout the upcoming months

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"in June of 2020, Khan Academy’s product team made the decision to deprecate Missions and, because the World of Math Course was directly tied to that feature, it has been deprecated as well." It se...

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3. Spider Mapping

It seems Khan Academy is finally getting a Physics C course. :)  Hopefully they'll start launching it throughout the upcoming months

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3. Physics C: M and Physics C: E&M

It’s great to see updates and that Khan Academy is finally introducing a calculus-based physics course. I’d definitely love to see more regular additions of exercises, especially more challenging o...

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3. Content update: Updated AP Physics 1 course is now live!

Just dropping this here it seems there is Organic Chemistry Practice on Khan Academy. Just not in the general Ochem Course that's on their science site.. Organic chemistry (Essentials) - Class 11 |...

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3. Requesting organic chemistry exercises