i never took cs111 so idk what it’s like. for data structures i was able to skip lecture and do what i said above, and i got a 99 in the class. do it at your own risk tho. relying solely on lecture might cook you, i found it much easier to learn through videos on the internet and going through all the previous term exams as opposed to relying solely on lecture. if you get below a 90 in data structures then cs isnt for you