You can find your contacts at our Examinations Office I here:
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The Examinations Office Math.-Nat. is responsible for mathematics and natural science subjects. You can find it here: https://www.uni-muenster.de/PAMathNat/
For Department 03, the Examinations Office of the Faculty of Law is responsible: https://www.jura.uni-muenster.de/de/fakultaet/pruefungsamt/
For economics degree programmes, the Examinations Office of the Faculty of Economics is responsible: https://www.wiwi.uni-muenster.de/pam/