Khan Academy is a non-profit educational organization that provides free video tutorials and interactive exercises. The Academy’s declared mission is “changing education for the better by providing a free world-class education to anyone anywhere.”
Khan Academy is also offering suggested student schedules during school closures here: https://docs.google.com/document/d/e/2PACX-1vSZhOdEPAWjUQpqDkVAlJrFwxxZ9Sa6zGOq0CNRms6Z7DZNq-tQWS3OhuVCUbh_-P-WmksHAzbsrk9d/pub
Google Play: https://play.google.com/store/apps/details?id=org.khanacademy.android&hl=en_CA
App Store: https://apps.apple.com/ca/app/khan-academy/id469863705