Sal Khan, a pioneer in distance learning, warns that distance learning does not replace the value of in-person instruction.
Sal Khan, creator of the free online learning site that bears his name, offers advice on what effective and engaging distance learning should look like when schools reopen this month.
The free courses increased scores an average of 115 points from earlier and preliminary scores.
Sal Khan says the new arrangements are the first he has forged with large, diverse school districts.
Officials said free test prep will "level the playing field" for all students.
Over the past decade, the free instructional website Khan Academy has transformed how tens of millions of students across the globe perceive and approach math. Now, it’s pursuing a bigger aim: transforming how students perceive themselves.