It is normal for candidates' productive skills (speaking and writing) to be of a lower level than their passive skills (listening and reading). A listening level of C1 and a speaking level of B2 is very common.
This is particularly the case with Asian students, especially Japanese.
One other thing worth pointing out:
'British English' and 'American English' are not as different as you might think. English is English - it's all one language. The main difference is accent, and, if you listen to the girl (Maude), her pronunciation is actually American: if she were doing an exam in the US, she would be saying exactly the same things in exactly the same way.