@bear19, the full-on tutorial system is unique to Oxbridge, but most universities have a tutorial / small group component- the way that US universities will have a lecture / discussion group pairing.
The good thing about the UK is that they put an astonishing amount of detail on their websites, including: pretty specific admissions requirements, what classes you take each year of the course (and what options there are-typically few if any options in the first year, esp in England; more each subsequent year), how you are assessed (typically most weight is on final exams or other large elements; homework/quizzes/participation not so much), accommodation, etc.
UK unis are typically much more hands-off than US unis, and even at Oxbridge it is rare for undergrads to know their tutors outside tutorials. You are expected to be full-on adult when you arrive, and students look to each other to navigate the system.
Admissions is almost entirely stats based (plus an essay about why you are suited for the course you are applying for and one LoR). For most unis the stats that matter are APs / subject tests; GPAs and ECs typically don’t matter or matter only minorly. Many courses will have specific pre-requisites- these are necessary not just for admission, but b/c you need to be ready for the level of work. You can cross check the requirements by looking up the usual “offer”, which is usually something like A*AA or ABB, etc, and the international requirements. Typically an A= 5 on an AP, B= 4, etc., but some places an A = 4. If the uni accepts subject tests they will specify what the equivalency is. If math at A level is specified, most of the time they mean Calc BC.
Note that the usual language is ‘offer’: most UK students apply with ‘predicted’ A level results- their GC provides predicted grades in the winter, the uni makes an offer based on those predictions in the winter/spring, the student sits the A level in June and results come out in August. A US based student with enough achieved APs /SATs (or a UK student on a gap year, who has their A level results) can get an ‘unconditional offer’.
If you post your daughters AP/subject test subjects, score ranges and course interests, there are lots of us here on CC who can suggest matches. Usual suspects include Oxbridge, Durham (which is collegiate, like Oxford & Cambridge- that is a University where you belong to a constituent College), Exeter, UCL, KCL, Imperial (for very strong STEM students), LSE, Edinburgh, Glasgow, St Andrews, etc. Note that most of the English courses are 3 years (modern languages and some sciences are 4) and the Scottish ones are 4 years.