The official examination regulations Fachprüfungsordnung (FPO) (German only; inofficial English version) gives you an overview over the basic rules behind the study program. It also contains information on the compulsory, compulsory elective or elective nature of classes, ECTS, semester hours and the design of the exam.
Please note that not all compulsory elective or elective options are offeres every semester / year. Refer to univIS for a list of classes that are actually taught per semester. If you have any detailed questions, please get in touch with the person responsible for the module or the study advisor.
For more information on CAU's legal examination procedure regulations please take a look at the Prüfungsverfahrensordnung (German only).