If you want University level courses, then here are few links:

CS Video courses: https://github.com/Developer-Y/cs-video-courses

Math/Science video courses: https://github.com/Developer-Y/math-science-video-lectures

Some of Electrical/Mechanical engineering courses: https://github.com/Developer-Y/engineering-video-courses

If you don't have problem understanding Indian accent, India's NPTEL publishes University level courses on this site: https://nptel.ac.in/course.html

You can take Indian IIT courses online with assignments (and proctored exams if you are in India) at following site: https://swayam.gov.in/