@moooop reminded me of a couple more things!
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There is much, much less choice on the modules/classes that you take in the UK than in the US. For example, at Durham in first year you would have one elective; at Cambridge you would have none. It is really important to read the year-by-year online summaries of what you do for each course that you apply to. Degree requirements are available online, but as moooop indicates are not models of clarity!
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Food varies hugely (even within a university- if you go to the UK site the student room (.co.uk) and search for Cambridge (or Oxford if you are re-thinking that choice…) / Durham colleges pros and cons, you will see how different the food can be!). ‘Living out’ is common at most universities (biggest exceptions being London, where accommodation costs are critical, and the collegiate universities). Most universities offer a range of accommodation, including ‘self-catering’ (ie you cook for yourself) and (especially after first year) it is more common not to eat in hall (again, except for the collegiate unis).
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You won’t have a roommate- if you share, it will be a set (everybody has their own tiny bedroom, and share a communal living space and kitchen/kitchenette).
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Depending on what college at Cambridge (or Oxford), there are different practices for what happens to your room outside of term time. UK students are expected to move out of rooms when they ‘go down’ at the end of term, and back in when they ‘come up’ at the beginning of the next term. Most colleges have some sort of arrangement for international students, but it always involves an extra fee, and often involves moving into a temporary room during the vacation. They use the word literally: vacation is when you ‘vacate’ your room, which they then rent out for conferences, etc. Policies differ by college.