To amplify @Conformist1688’s point about the acceptance rate: there are several key differences between the US & the UK:
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in the UK students can only apply to five courses, whether it’s the same course at 5 universities (eg, straight physics at Manchester and 4 other universities) or at the same university (eg, physics, physics with astro, physics w/ philosophy, physics w/ study in Europe, and physics w/ theoretical physics, all at Manchester), or a mix and match of course and university.
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in the UK you write one “Personal Statement” (PS), which all of the things you apply to read, in which you demonstrate that you know enough about the course to know that it is a good fit for you, and you make your case as to why you are a good candidate for it from an academic perspective. Thus, students typically apply to a narrow range of courses where they have focused their schoolwork and their ECs. Depth more than breadth.
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In the UK your teachers “predict” your likely A-level grades; you apply with those grades and if you are offered a place it is “conditional” on achieving those grades when you take your A-levels in June. So, most students only find out if they made their “offer” in August when A level grades come out. UK schools work really hard on the predictions- and they build their reputation for accuracy over time. So, a Physics teacher won’t ‘predict’ an A* for you in physics if s/he has any serious doubt that you will achieve that mark. And if your teacher won’t predict that you will achieve the mark, your odds on getting an offer are minuscule, so you don’t apply - meaning that pretty much everybody who applied was predicted to achieve the usual offer of 1-2 A*s and 1-2 As- an offer in line with Oxford and Cambridge expectations, btw.
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In the UK your school writes your LoR- and before that they have met with you to talk about what course(s) and university/ies you are applying to. You can apply where you want, but schools typically don’t encourage students to shoot higher than the marks they are able to achieve. The LoR is an important piece of the application, b/c it speaks to your teacher’s assessment of your ability in that subject.
5). In the UK each course will either make you an ‘unconditional’ or a ‘conditional’ offer, or they will reject you. Unconditional offers are mostly students on gap years (who are applying with ‘achieved’ marks); most students get ‘conditional’ offers (or rejections). Once your last response has arrived (mid-March), you have 14 days to “Firm” one offer and “Insure” one offer. That’s it. Your “Firm” is your 1st choice: if you meet that offer then that is where you will go. But, if you miss your offer, the course you “Insure” is your backup plan. For most students that means there is a big-ish jump between the 2 offers (because you want to be really sure that you can meet the Insure offer). It’s sort of like committing to go to either a reach or a safety school in the US system. So again, students choose where they apply more thoughtfully and more strategically.
As for US applicants: the SAT is merely a notional gateway, and the GPA is even less important (most UK universities don’t ask for it, and the ones that do have only added it recently b/c US students are so fixated on it). What they will really care about is relevant standardized testing. A 5 in Calc BC is going to be necessary (the 4 listed in the US students section is indicative, but an A* in the Physics section tells you that a 5 is likely essential), along with at least one of the Physics, and a 3rd science. They will be deeply uninterested in your humanities APs.
Note that the 70% admissions rate is the average for the University. Even with all the limiting factors noted above, last year there were 1700 applicants for 310 physics places (across all 5 specialty areas). That is effectively an 18% acceptance rate, from a group in which the vast majority will have been predicted to meet the typical offer, but remember that there are also students who will get an offer, not get the Alevel results needed to meet it, and lose the place.
Finally, have you read the course description(s) carefully? In your first 2 years, about 80% of your classes are mandatory, 20% optional - mostly from an approved list; in 3rd year that moves to 60:40. For your classwork assessment is based solely on final exam (labs are assessed based on lab projects). If you compare what you are required to take in 1st year if you enroll in physics or physics w/ philosophy you will see why the selection of what you apply to matters (though there is room for moving between them between 1st & 2nd year if you have chosen the right classes for your options and do well in them).
Ime, US students who meet the typical offer at most UK unis (excluding Oxbridge, LSE, Imperial, and StAs) tend to get offers (mostly the unis love US$$, and if you can’t cut it, no skin off their backs), but for this course I would be a little less sanguine. If you have the APs, and you love the look of the course, by all means go for it.