LU training is exceptional, but that excellence also demands brilliant candidates - which you have already demonstrated by getting this far.
From memory, there is a Fire Assessment which you can fail on the second day, and Rules and Procedures, which you can fail, and a final sort of consolidation test at the end (which covers everything you have been assessed on up to that point.
The training is intense, but new candidates are already the cream of the crop - you were probably selected out of 20k applicants, so you are half way there. As long as you pay attention, take notes, do a little homework, and ask questions, you will all be fine.
It is a well oiled machine that is specifically designed to get people through as quickly as possible and with the required knowledge.