Feel free to post troublesome questions here. Occasionally they are not well formulated, and that helps me to improve them. But usually the problem is that they are precise and students haven't learned to make the relevant distinctions. We can help you with that here, too.
The time on tests is appropriate, as reflected by the class average. It's important to remember that since it is an online test, I can't restrict your access to materials, so a significant time restriction is necessary as a way of requiring that students know the answers rather than simply look them up. If you have been using the quizzes as study tools, and are only taking the test after doing very well on all the quizzes, then test questions will be very familiar to you.
The average performance on these tests is about 14/20, which may strike students as low. However,, if you are doing the journal diligently and well, then every entry effectively adds 3 points to your test score. So someone who gets a 14 and does the journal entry well, can think of that as a 17 or 85%. Even if you get a 12, a D-, you can lift it to a C by writing a strong journal entry.
So in the end, the course is hard work, but students who work hard and methodically tend to do well.