Hi everyone, So, I'm currently in my second year (undergrad) of university studying nanoscience/physics in Canada. I try to think about my future career fairly often, so that I can do my best to make good decisions. However, I'm beginning to get the feeling that I'm not truly "mastering" the material that I learn in my physics courses. That terminology is vague, so I'll try to clarify what I mean. Looking back at highschool, I'm quite sure that I mastered the material in my math/physics courses. If someone walked up to me on the street and said, "Hey, do this integral of a highschool-difficulty-level single-variable function" or "Solve this projectile motion problem," then I'd respond, "Yeah, no problem." Now, with my university course material, although I'm doing fine in the courses (80s or 90s, so I can't really complain), I feel like if someone came up to me and asked the same type of textbook-style question, I might not be able to do it so easily. In other words, I feel like I'm sort of scraping by, even though my marks seem to say otherwise. I feel like I know the material, but I don't yet feel that it's truly internalized. So, I guess my question is, is this an issue worth worrying over? Since physics is cumulative, do you think that by 3rd year, all of my second year material will feel internalized and I'll feel the same way about 3rd year courses (i.e. is this feeling I get just a result of newly-learned non-intuitive material)? And perhaps most importantly, would it benefit my career in the long run if I devoted a lot of time to solving as many textbook-style problems as possible (not necessarily to any benefit of my course mark), or would my time be better spent elsewhere?