I'm frankly disgusted with the way that some people on this forum have responded to the OP. Here is someone who is clearly completely unfamiliar with higher education, and for whom here is no tradition of going to university in the family. So, they're at the start of a very steep learning curve, but are clearly willing to learn. Unfortunately, by coming on here half of what they've heard is that they're hurting their son. It must be nice to exist in social circles where going to uni is the norm, and people value education for what it is, but not everyone does. Can't MN help someone, rather than being so catty?
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Anyway, here's rightsaidfrederick's potted guide to university for the uninitiated
Applications
Your son will apply via UCAS for five universities. This must be done by January 15th, though his college will probably have an earlier internal deadline, possibly before Christmas. He should aim for universities that are around his grade predictions - for instance, 3 that ask for AAB, one or two at ABB and one at BBB. The entry requirements are listed on every university's website, but as a starting point, www.whatuni.com lets you search by entry requirements.
However, I'm not sure I'd recommend applying to Oxbridge, given that
- the deadline's already passed, so he'd have to take a gap year
- Oxford would make him study management instead of finance, which doesn't seem to be what he wants
- both want A*AA, but he's only predicted AAB
- even if he did happen to get A*AA and reapply on a gap year, entry is still something of a lottery.
He will then receive conditional offers from some or all of his universities. This means that they want him to come, subject to him getting certain grades in his A Levels. He will then choose a firm university (the one he really wants to go to) and one insurance university (the one he'll go to if he doesn't get good enough grades to go to his firm, but still gets the grades required by his insurance). A Level results come out on Thursday 14th August.
There's some information here from UCAS for parents and guardians about the application process www.ucas.com/how-it-all-works/parents-and-guardians
Finance
With regards to student finance, he will get a tuition fee loan for the full £9000, so no one has to pay upfront. The money for his living costs is means tested, comes partly in loans and partly in grants, and is based on your household income (parent he lives with + any live in partner).
Student loans aren't like normal debt. In fact, they're the nicest loans that he'll ever get in his whole life. He only pays back 9% of anything he earns over £21,000 per year, so if he earned £22,000 per year then he'd pay back £90 per year, and if he earned £30,000 per year he'd pay back £810 per year. As you can see, this is very affordable.
If he never earns over £21k, he never pays anything back. Anything he hasn't paid back after 30 years is wiped off. It doesn't affect his credit score or ability to get a mortgage, and bailiffs will never come knocking on his door. This is a nice little calculator that shows how much repayments are www.moneysavingexpert.com/students/student-finance-calculator
This is a useful guide www.practitioners.slc.co.uk/media/494509/sfe_parents_quick_guide_1314_d.pdf
You can work out how much he'll receive in loans and grants using this handy calculator www.studentfinance.direct.gov.uk/portal/page?_pageid=153%2C4680136&_dad=portal&_schema=PORTAL
If you're a low income family (and you'd be surprised what counts as low income), he'll also be eligible for a guaranteed non-repayable bursary from the uni itself. These vary from uni to uni, and details can be found on the website of the uni itself. Bursaries can be quite substantial - my own uni gives out up to £3000 per year.
The Course
Economics and finance is essentially the study of money and how it flows around the 'system'. It involves a lot of maths, so I hope that he is doing maths at A Level, otherwise he will have fairly limited options, with regards to which unis he can go to for economics.
University degrees are not like schools, in that every university designs its own courses, writes its own exams and marks its own exams. This means that there are very great differences in what is taught at two different universities, even when the names of the courses are identical. So, it is incredibly important that your son does his research and makes sure that he looks at the modules taught at each different uni, and makes sure he likes the look of them.
Economics graduates are highly employable, and so long as he gets good grades he will have lots more career opportunities open to him than he does now, he will be able to earn more than he can now, and he will be able to choose a job that he enjoys.
I'd really, really, really recommend that you and your son join www.thestudentroom.co.uk - it's a website full of people who are applying to university who help each other out, plus a sizeable contingent of admissions tutors, current students, teachers and knowledgeable others who help applicants out.
Any other questions, do feel free to ask :)