If there is a make-up exam, why not? The make-up exam is D-(from F to D on URP), but it is F. Re-taking is equivalent to getting an F first and another grade next semester. The f on URP can't be erased. The grade 10 can be counted as f when calculating the degree, but it is counted as f elsewhere. How ugly do you think an F is?
The difficulty of make-up exam is uncertain, depending on the teacher. Some teachers think that volume A can't pass, so they simply drain volume B.. Some teachers think that to give you a holiday preparation, paper B should be more difficult than paper A. You know, it is also B who postponed the exam, just like make-up exams.
The make-up time for the British exam should be the same for all grades. You should ask the British Ministry or the registered examination center which grade is in which classroom.