All exams, tests & quizzes have different settings and are configured differently.
Default setup by the system/managers are that you need to click 2 times to select and confirm your selection. With other words, one time to select your answer, and one more time to confirm it.
If you can't finish your test, most likely you forgot to read the pre-instructions (click two times to register then answers) when starting the test.
- My session hung itself and I cannot continue.
Sometimes it might be a temporary issue with your internet connection, please check this article for further information.