AP Stats has undergone changes for the 2026-2027 school year (https://apcentral.collegeboard.org/courses/ap-statistics/future-revisions). What was once 13 units in Khan Academy is now 5. This change I believe happened this week at Khan Academy, as unit test certifications entered the Certification Team queue as recently as a couple days ago (9/13/26). The 13 existing unit test links from Schoolhouse are all broken, with only the course challenge link still functional.

Image from https://www.khanacademy.org/math/ap-statistics attached.

Images from https://schoolhouse.world/certification/get-certified?course=Statistics&sort=coursesequence&page=1 attached.