I'm not really sure with that but maybe if you enroll in a school/college that follows the international a level too? otherwise, GCE A levels are kinda the same yet with more units(same content I think) and practicals instead of written-examinations such as in bio/chem, perhaps physics too(?) Assuming you did your exams through the British Council, their headquarters is in London so I'm pretty sure you'd be able to complete your exams there but contact them!