I get overwhelmed while self studying courses. What can I do when I can't sit in classes anymore?
Reading and watching videos is not a substitute for learning. Treat the material like you would if you were in a class. Find exercises that you can do to assure that you have &quot;mastered&quot; the material. Take notes. Make checkpoints at which you can assess your progress. You learn from reinforcement and feedback. The latter is hard in online learning. Find someone who can give you some feedback and answer questions. Find a working group if possible and learn it as a group, reinforcing one another.
I wonder, also, whether you can informally sit in on a course while not taking it. A friendly professor might permit it and even let you take exams informally. I've done this as a professor, actually, when wanting to learn the basics of a new field.