This study aimed to evaluate the effect of bonus exercises in the final course evaluation and was conducted at the University of Tartu in an Engineering Graphics course from 2010-2012. We assumed that those students earning extra marks and making an extra effort on their studies would earn a better grade even without the extra marks. The motivation to study was given by teachers and was extrinsic but it could lead to intrinsic motivation when students learn more. However, motivation itself was not under research in this study.