The retake exams for the lectures from TUM School of Management are scheduled for the following semester. For the technical specialization, it depends on the faculty. For electrical engineering and mechanical engineering, the retakes take place in the next semester, at the beginning of the lecture-free period, similar to the retakes of our faculty. For Informatics and Chemistry the retakes are usually at the end of the semester break.
The date of the exam is usually set before the middle of the semester. A small trick: if you look up in TUMonline the past reservation of exam rooms, you might sometimes find also a reservation of a past exam. The probability that the day of the exam will change in the current year is quite low. This technique is a bit costly in terms of time, but it might be the only option.