Non-binding exam for the first semester of study:
Beginning your university studies is connected with a number of new challenges. The University of Potsdam acknowledges the difficulties that come with having to orient oneself in an unfamiliar environment: Examinations that are taken in the first regular semester of study and that failed at their first attempt can be disregarded. That means any first attempt in the first semester can be counted as not happening if you fail. For example this can be used too in case you get a bad exam grade and would like to simply drop this grade for trying again.

Using 2 free attempts during the regular 4 semesters in the CLEWS program possible:
Each student in CLEWS can use 2 free attempts! You can use this to improve any module grade within the regular study time of 4 semesters. For this, you need to submit the completed form to the Examination Office (during office hours, by mail, or into the office mailbox) no later than 14 calendar days after the announcement of your examination results.

More info: https://www.uni-potsdam.de/en/studium/studying/organizing-your-exams/non-binding-exams

A block course is a type of intensive course in which all the lecture is held in a short time period for example within one week. The lecture times usually are from 09:00 to 17:00 from Monday to Friday. Hence, you have to block the whole week for doing that course. Doing other academic or work activities in that time is not recommended due to the workload of the block course. The exam of such a course usually is conducted at the end of the week. The main advantage of a block course is that you can accomplish a whole course in a short time period, have a very intensive working environment, and of course lots of fun.