Another point: US universities look very different from German ones. I live in Corvallis (OSU) now but grew up and went to school in Stuttgart Germany. Compared to the German universities our US schools are country clubs: dorms, restaurants, coffee shops, fitness clubs, green spaces everywhere. Don't even get me started on the sports, it's an outrage how US schools have become sports franchises. I'm guessing most US…
Don't they have practical courses? Do experiments? Soviet and post-soviet education systems were modelled after german ones, but lab practice makes around 30%. For more abstract topics, practice/discussion/seminars.
- lectures: final exam that accounts for 100% of your grade, and sometimes (possibly obligatory) regular homework
- practical courses / labs: how grades are assigned vary, sometimes this will be a "do a project in a team" kind of assignment, sometimes it's experiments where you are expected to write one or more reports
- seminars: you'll be assigned a topic (usually some recent, narrow scientific result, no wildcard giant topics here) and expected to write a report on it & give a presentation
The exact mixture depends on your course of study.