Those students who - are not an EEA national, are without any nationality, have a non-national travel document, or have a passport issued by an authority which isn’t recognized in the UK - should obtain a students visa to enter UK with study purpose. So with the points included above, you verify whether you have to obtain a visa or not.

More information on student visa to UK can be found here:
http://www.ukvisas.gov.uk/en/howtoapply/infs/inf5students

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