The following resources cover more than one subject :D
![khan-academy1 khan-academy1](https://cdnsm5-ss16.sharpschool.com/UserFiles/Servers/Server_315391/Image/Students%20Resources/Peer%20Tutoring/General%20Resources/khan-academy1.jpg)
[Khan Academy] Explanation Videos & Example Problems
Math • Physics • Chemistry • Biology • US History • World History • Health & Medicine • Grammar
Test Prep • College Admissions • Art • Computing • Economics
[Crash Course] Lecture Videos
Chemistry • US History • Ecology • Biology • World History • Anatomy & Physiology
Literature • Psychology • Economics • Government & Politics • Physics • Philosophy
Astronomy • Intellectual Property