I have used a Youtube channel for few years. I think it is quite useful for my high school and college study. The YouTuber in this channel is called Micheal van Biezen. He has made many series of videos to teach students about Physics, Engineering, Chemistry and Advanced Maths. He can explain the concepts clearly and teach you how to solve the standard questions.
He has a learning website for students to learn more systematically: http://www.ilectureonline.com/
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