ODB
https://odb.org/#
algebra 125
https://www.youtube.com/playlist?list=PLSQl0a2vh4HDdl6PcjwZH2CkM5OoV6spg
High School Geometry Course 199
https://www.youtube.com/playlist?list=PLKi4WTp6PRGVBM1nPhwW1lTuxi32Q0IZ3
High School Physics 103
https://www.youtube.com/playlist?list=PLB03A41EA88A8DE65
Introduction to chemistry 123
https://www.youtube.com/playlist?list=PL166048DD75B05C0D
biology 47
https://www.youtube.com/playlist?list=PL8dPuuaLjXtPW_ofbxdHNciuLoTRLPMgB
出口仁 大家的日本语
https://www.youtube.com/watch?v=U8wniu_c_zc&list=PLN6lpNcgHEjpskQBXPj1TopxSIcfdL8L5