This depends on whether the respective module is mandatory or not. If you failed the exam for a conditional subject or for a module that is marked as mandatory in your module catalog (please see the footnotes there) you cannot switch it. You have one year (= two attempts) to pass your conditional subjects and three attempts to pass any other mandatory module. If the module in question is not mandatory, you can switch your registration for the repeat exam to another module of the same module group with the same ECTS value. Please note that your failed attempt(s) will be subtracted, meaning that if you switch to another module after a first failed attempt you will only have two attempts left to pass the exam of the new module. If you switch after your second failed attempt you will only have one attempt left to pass the exam of the new module. If you switch from one module with 5 ECTS to two modules of the same group with 2,5 ECTS each, the failed exam attempt(s) will only be subtracted for one of them, meaning that you will have  three (=regular) attempts for the other. If you want to make use of this option, please send an email to Ms Helga Jahreis of our Examinations Office (helga.jahreis[at]fau.de) during the official exam registration period and ask her to switch your registration to a new module of the same module group. If exam registration period is already over, you can only switch your registration to exams of the same module group which you have already registered for.