After clicking the button "Evaluation" the correct answers are shown, along with the number of points achieved.
You may try so solve the complete test without evaluating each question, and click the "Total evaluation" button. It will show the sum of all points achieved.
On the interpretation of the number of points achieved: If you click answers by random, the number of points achieved will statistically be just half of the maximum (because the number of correct and incorrect answers are equal on the average). A positive result has thus been achieved if the number of points is considerably above half the maximum. In case your result is considerably less than half the maximum, you display a systematic tendency to incorrect answers (maybe on account of some misconception biasing your understanding of the subject in a systematic way).