I have developed two web applications using the exam questions provided by OWASP:
OWASP Top 10 Threats and Mitigations Exam - Single Select, 70 Questions
OWASP Top 10 Threats and Mitigations Exam - Multiple Select, 36 Questions
The multiple select exam contains a sub-set of questions from the single select exam, however, they have been changed so that there are multiple correct answers to choose from. We are interested in feedback on which type of exam people prefer. Multiple select exams are much harder and the answers sometime feel more ambiguous. Single select exams are easier since you only need to select the one best answer to get the question right.
For more information see the OWASP Exams Project at https://www.owasp.org/index.php/OWASP_Exams_Project