[vz8]

A couple studies indicating benefits from Khan Academy, just from a cursory search:

16% lift in overall test scores: https://www.ischool.berkeley.edu/sites/default/files/sprojec...

11% lift in math test scores: https://bearworks.missouristate.edu/cgi/viewcontent.cgi?arti...

And Khan Academy's impact page: https://www.khanacademy.org/about/impact has links to additional studies.