What is life at Oxford uni like?

Broadly, student life at Oxford is very good and I had a great time during my studies.
To answer your questions:
You will meet lots of very nice people - some are competitive but I generally got the vibe that most people wanted to help each other out with the work. It is fairly easy to make friends due to the college structure meaning you will already be part of a smaller community as an undergrad with lots of social opportunities within college. There are also plenty of societies where you can meet like-minded people across the university too. You'll also get to know the people on your course pretty well, especially those who you have tutorials with.
You will have to spend a lot of time studying and probably more so than at other unis as terms are only 8 weeks long and there is a lot to do. However you will still have free time when you're not studying and plenty of people go out and go clubbing. Oxford is not a super lively city in terms of nightlife but there are a few good clubs and bars and there are also likely to be socials and nights out organised in your college (e.g. bops which are a big college party, usually with a costume theme). You just have to be organised with your time and make sure you are on top of the work. The holidays (vacations) are long but you might have uni work to do then/preparations for collections (mock exams) or exams in the following term/a part time job to occupy your time, and people don't generally stay in Oxford during the vacations as college accommodation contracts tend to be term time only.
You can expect your degree to be like a full time job in terms of commitment, but there will be some weeks where you have tons to do and others where you can afford to take a little more time off. It can be intense because you will probably be doing some kind of essay/written work every week during term time and you'll also have to do the reading every week and attend any contact hours in order to be able to write the essay. There is a lot of independent study involved so you need to get really good at managing your time and taking responsibility for your own learning. But independent study also means you have the freedom to pursue your own interests within what you are reading about that week.
The food depends on your college, though most have pretty good catering. Most (but not all) colleges will also have self-catered accommodation for at least some of their undergraduates. In some colleges/accommodation the expectation is that you eat the college catering so there may be limited cooking facilities. If being able to cook for yourself is important to you definitely consider whether the colleges you are looking at will have proper kitchens as you can't assume they will! There are also lots of great places to eat in the city more broadly.
There isn't a campus exactly as Oxford is a city university meaning the colleges and university buildings are dotted all around the city of Oxford. Oxford itself is a very beautiful city. Most of the colleges also have beautiful old buildings, gardens and green space. Some have a more modern architectural style though as they are newer so that is also something to think about regarding college choice. There are also many parts of Oxford that just look like any UK city.

Oxford undergraduate degrees are academically very challenging. Every undergraduate is expected to produce high quality work. At Oxford, being studious and very into your subject is the norm. But the opportunities for fun are endless.
I and most of my friends from Oxford had a great time there, years ago. We are still friends years later. We love our college and meet up there from time to time.
My daughter is currently at Oxford. She is having the time of her life. She is working very hard, making friends, partying like mad, and participating in her favourite sport.
I am biased, of course, but I think that Oxford is the best university in the World, that Cambridge runs it a close second, and I wish that the UK had ten Oxfords and Cambridges. Sadly there is only one of each and they have probably reached the limit of expansion, having trebled in size in recent decades.
Some people don't like the combination of academic and social intensity at Oxford and Cambridge. Some people don't take to college life or the tutorial/supervision systems. Some don't like the breadth of the courses.
There are other good universities which use a different model for academic and social life.
Visit several universities and see what you think.

Thank you for the advice! Oxford sounds like the perfect university for me- I hope I can get in. Do you have any tips for getting in? You seem experienced in the area, considering you and your daughter both got in!

If you are/were a student at Oxford, what is student life like there?
Are the people nice or are they competitive? Is it easy to make friends and do you find that people are more interesting and complex?
Do you have to spend a lot of your time studying or do you have a lot of time to do young-person stuff like clubbing and going out?
Is it very academically challenging and do you have time/the capacity to enjoy your course despite the mental and academic demands?
Is the food good and is the campus beautiful throughout?
Any other interesting facts about student life you can provide...

Thank you for the advice! Oxford sounds like the perfect university for me- I hope I can get in. Do you have any tips for getting in? You seem experienced in the area, considering you and your daughter both got in!

What are you wanting to study, I can’t see this in your posts?

English literature, most likely. Or physics.

Two very different subjects with two very different sets of subject requirements.
Physics obviously needs you to take physics and maths (and you are pretty much expected to take further maths if your school offers it) with grades equivalent to A*AA at A level or better where the A* is in one of the three aforementioned subjects. English however requires at least one of English lit, English language or English language and literature plus two other subjects with grades equivalent to AAA at A level or better.
In theory you could do physics, maths, further maths and an english subject, then decide which course you would prefer to take. I probably wouldn’t take 4 A levels as you only need 3 and will probably get a stronger set of grades with 3 subjects. However, if you were to take just 3 subjects you’d have to pick between english or further maths which would effectively decide which degree you go on to apply for before even starting A levels. I also think that if you were to take the above combination (with or without further maths), you’d probably have quite a weak application for english overall so in truth I think you really ought to decide on which of the two subjects you’d prefer to study ASAP and pick your A levels accordingly if you haven’t already.

Would having Physics, Maths, Further Maths and English literature mean I have a weak application for English? English is the only required A-level. It would be helpful to have humanities but would it really be weak?

Broadly, student life at Oxford is very good and I had a great time during my studies.
To answer your questions:
You will meet lots of very nice people - some are competitive but I generally got the vibe that most people wanted to help each other out with the work. It is fairly easy to make friends due to the college structure meaning you will already be part of a smaller community as an undergrad with lots of social opportunities within college. There are also plenty of societies where you can meet like-minded people across the university too. You'll also get to know the people on your course pretty well, especially those who you have tutorials with.
You will have to spend a lot of time studying and probably more so than at other unis as terms are only 8 weeks long and there is a lot to do. However you will still have free time when you're not studying and plenty of people go out and go clubbing. Oxford is not a super lively city in terms of nightlife but there are a few good clubs and bars and there are also likely to be socials and nights out organised in your college (e.g. bops which are a big college party, usually with a costume theme). You just have to be organised with your time and make sure you are on top of the work. The holidays (vacations) are long but you might have uni work to do then/preparations for collections (mock exams) or exams in the following term/a part time job to occupy your time, and people don't generally stay in Oxford during the vacations as college accommodation contracts tend to be term time only.
You can expect your degree to be like a full time job in terms of commitment, but there will be some weeks where you have tons to do and others where you can afford to take a little more time off. It can be intense because you will probably be doing some kind of essay/written work every week during term time and you'll also have to do the reading every week and attend any contact hours in order to be able to write the essay. There is a lot of independent study involved so you need to get really good at managing your time and taking responsibility for your own learning. But independent study also means you have the freedom to pursue your own interests within what you are reading about that week.
The food depends on your college, though most have pretty good catering. Most (but not all) colleges will also have self-catered accommodation for at least some of their undergraduates. In some colleges/accommodation the expectation is that you eat the college catering so there may be limited cooking facilities. If being able to cook for yourself is important to you definitely consider whether the colleges you are looking at will have proper kitchens as you can't assume they will! There are also lots of great places to eat in the city more broadly.
There isn't a campus exactly as Oxford is a city university meaning the colleges and university buildings are dotted all around the city of Oxford. Oxford itself is a very beautiful city. Most of the colleges also have beautiful old buildings, gardens and green space. Some have a more modern architectural style though as they are newer so that is also something to think about regarding college choice. There are also many parts of Oxford that just look like any UK city.

E M Forster: "only connect". You might appear a bit thin on context. History and languages go well with English
Maybe do the IB, as that permits a broader mix of science and humanities.

What is the IB?

International bac, an alternative to A-levels.

It may seem like an immature question, but how hard did you find getting into oxford? Are there anything you did when you're in secondary that helped you to get in? I'm in year 10 and I just wanna maximise my chance of getting in so are there anything i can do?

Whilst I'm not who you asked, I honestly think it would be sensible to state which subject you are applying for as some subjects are less demanding than others in terms of what they require of applicants (e.g may or may not have admissions tests, require some piece of work to be submitted to them etc, but regardless of the subject you will have to complete a full UCAS application and hope it is enough to get you shortlisted for interviews). It will also help to know as the majority of the specific recommendations I would give for things to do to get in for my subject (chemistry) would be utterly useless to you if you were applying for any other subject.
In any case, have you considered mentoring less confident classmates in any of your subjects (ideally in subjects more closely related to the degree you want to take or the A levels you will need to take for it)? This is an excellent form of revision for starters and will help you secure the strong set of GCSE grades required and hopefully will make thinking out loud something you become accustomed to well before any interviews. Of course, I'd continue this mentoring into A level as it is perhaps more useful then.