Khan Academy

Khan Academy is a massive system of excellent lessons, guides and resources.

https://www.khanacademy.org/

https://khanacademy.zendesk.com/hc/en-us/articles/360040167432-How-can-Khan-Academy-be-used-for-remote-learning-during-school-closures-

Khan Academy is a free resource for students, teachers, and parents.

What is Khan Academy? We offer exercises, quizzes, and tests so students can practice and master skills, as well as instructional videos to help students learn or review material.

• Khan Academy has a library of standards-aligned lessons covering kindergarten through early college math, grammar, science, history, AP® courses, SAT® preparation, and more.
• Students can practice skills with exercises, quizzes, and mastery challenges and get immediate feedback and support.
• Khan Academy is available in 40 languages. 
• Students without laptops can access the Khan Academy website or use the Khan Academy app on smartphones.