I'd agree that it makes sense to take subjects you can't learn on your own, and avoid subjects that are poorly taught, but I imagine that varies a fair bit by school. My school's language classes were pretty terrible; I learned Spanish from spaced repetition and watching movies, which is probably not optimal. In contrast, our science classes are decent, and I personally benefited a lot from talking things over with classmates (for a recent example, no one in my class understood thermodynamics, so we spent a couple hours talking it over together before someone figured it out.)