Comment by Panzerschrek

Yeah the clock game is weird. One solution was "fünfundzwanzig vor zwei" which I never heard in my life (native German). At least in my region one would say "fünf nach halb zwei" or "Ein Uhr fünfunddreißig".

Interesting. 'um X' gets labelled wrong as well. I guess at least with times OP needs to throw away the notion of the single correct answer. But yes a lot of these 'correct answers' sound uncommon in talking or in general.

A thing that OP might also not know: 'punkt acht' is 'precisely at eight', if you want to say 'eight o'clock', that's 'um acht'. The literally meaning of something being 'um' is, that something has passed fully, or is completed.

Your first one gets me puzzled. Normally, you take the shorter time to the full hour. Nobody says 'fünfundvierzig vor zwölf', for example. I never said or heard 'fünfunddreißig vor zwölf'. Before half past an hour everyone says '... nach elf'.