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Can't give you an exact translation. But:
You have a "Quartalprüfung" (quarter of a year = 3 months) a control or someting like that and there is a "Tertialprüfung", means a control every four months of a year = 4 months.
Automatic update in 00:
1 hr confidence:
Explanation: ...as in 3rd level of (some) examination (schedule)
...can't see what else it could be without further context
Erich Friese Australia Local time: 19:48 Native speaker of: German, English PRO pts in category: 4