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If you ask about Internationally recognized universities like Oxford, Cambridge, NAU, Imperial, Melbourne, ITT etc they all require FULL four years of high school, note no exceptions, no matter how smart you son/daughter is.
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Nope, if you're under 17 you are no allowed to stay in university owned accommodation in the UK without a parent or guardian and must be accompanied to lectures for legal reasons. But other than that if you meet the entry requirements it is possible to be accepted. There is definitely at least one 15 year old boy here in Oxford. However, I have heard they are thnking of changing this due to changes in the law and because of a case years ago about a student who was forced into attending by her parents and then ran away due to stress.
<a href="http://news.bbc.co.uk/1/hi/uk/816469.stm%5B/url%5D">http://news.bbc.co.uk/1/hi/uk/816469.stm</a></p>
<p>I found the article below using google</p>
<p>In general the school system in the UK is not about the number of years spent studying anything. It's all about whether you have achieved an exam pass in a subject. Otherwise no number of years studying counts. You have to have nationally certified proof that you passed at the required level. Having said that, it's considered unhealthy and unwise to skip years of school so it's pretty unusual for anyone to take A-levels (exams needed for university entrance) under age 17.</p>