Courses on Theoretical Computer Science often have to deal with a high amount of frustration and high failure rates. To find a possibility to counter this, interactive learning units for self-studying and self-testing using exercises were created in the learning management system Moodle. These learning units were offered as supplementary material in the winter term 2017/2018 and the summer term 2018 in courses at the german universities Technische Universität Berlin and RWTH Aachen. In this article, the studies, which evaluated the effects of this offer, are presented and their results are discussed. The results indicate that the learning units were helpful for the students concerning the course content as well as several motivational aspects.