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My Eldest DC did the IB and is now a second year medicine student. He doesn't have any other qualifications at all but still got offers. His offers were all 'standard' offers, ie the entry requirements given in the Universities Medicine Admissions Pages or Policies. Medicine offers tend to be very standardised.
My son was told by someone in the admissions dept at Barts that although the IB requirement was more stringent than the A level requirement that there was more wriggle room if you missed a grade on one of your exams unlike A levels grades where the is no scope for applicants to miss a grade. I have no idea if this is true in practise but it would be nice if it was
No, but will watch this thread with interest as DD1 is planning to start IB in September. She had a chat with a former IBer recently who told her that Edinburgh, Oxford and Cambridge were not as keen on IB as most other universities, but that was not specifically for medicine.