I'm still struggling to graduate from undergrad, due to Corona this is my 10th semester. I spent more than two years for mathematical analysis as well as linea

I'm still struggling to graduate from undergrad, due to Corona this is my 10th semester. I spent more than two years for mathematical analysis as well as linear algebra, because the professor in charge of the course was different every year, I had to re-identify the symbols used by the professor, otherwise I would have had a hard time understanding the questions in the assignments and exams. I also know that there are many quality online resources such as 3b1b or MIT linalg, but I don't have enough time to watch them during the semester, because I'm already tired of dealing with the deadline of my weekly assignments. In particular, I often encounter situations where I have to do the work of two people by myself, because homework partner is unreachable or withdraw from the course, and I cannot find a new partner. In a sense these are very contradictory.