The following is a list of some links to centres that take external private candidates who wish to sit for GCSE Arabic exams. There are other centres that also allow external private candidates, local Secondary Schools, Colleges, Community or Saturday Schools are the usual options. If you know of a centre and wish to add it below please feel free to use the contact details. If there are any errors or broken links please let me know.
Ealing (London): https://www.ealingindependentcollege.com/external-exam-candidates/
Kensington (London): http://campbellharris.co.uk/Content.asp?ID=41
Blackheath (London): http://www.corellicollege.org.uk/external-candidates.html
Central Oxford: http://www.greenes.org.uk/examinations/
Aylesbury (between Luton and Oxford): http://www.mapleeducation.co.uk/services/exam-centre
London Exam Centre: http://londonexamcentre.co.uk/
Macclesfield (Cheshire): http://www.privateexaminationcentres.com/
Pdf Guideline: http://www.privateexaminationcentres.com/