Hello Guernott and julien6887
when I was in Hamburg (I was originally for Condor there), there was only KRN-mathematics - 1 block the questions were shown in written form, one block the questions were given over the headset.
at the CRM just tell them what you think and it will be ok
I don't know 'ace'. I just had the Oxford books
there will be no interview - this is in stage 3 at the FQ
I was only at the first stage, this is just one day
I don't know any details of the success rates. Just do your best and hope it is enough - so did I, and it was obvioulsy enough