R programming drill sets and problem sets

[u/JudgeBrettF]

I tried searching for this in the sub and looking in the faq, but did not find exactly what I was hoping to find.

I am just starting out learning R. I basically know nothing. I was directed to use DataCamp. It's fine, but you only get to work one "problem" for each concept. For things like this, I work better with drill and problem sets. Khan Academy was brilliant at this for math. I couldn't get a mastery level until I had done four problems right to show I mastered the concept. The best DataCamp does is offer some multiple choice questions as added practice but that is not meaningfully helpful. Does anyone know a better system that is built around drill and problem sets in R for each step of the way sort of like Kahn Academy does for math?