I looked at the OCW stuff when I took calculus at a community college. They cover the same material but a lot of the homework and exams are made of word problems which makes it (arguably unnecessarily) very hard. After that I only used OCW for lectures and book suggestions and never for worksheets/exam/practice problems because if I want to study calculus then I'm going to focus on that.
You can take it either way. It's hard, but not in a way that makes you better at the subject.
I think I would disagree. One of the aspects of an MIT education (c/o 2017) was the fact that we were forced to decipher problems from statements in a similar way that one would be forced to do so in real life. Problems should (and almost never do) come packaged in a neat and nice way that is easy to solve, hence why I believe that word problems and sometimes confusing problem statements are beneficial.
You can take it either way. It's hard, but not in a way that makes you better at the subject.