Can someone tell me what are the average test scores for the Watson-Glaser Critical Thinking Appraisal? Is it possible to get every question correct in this test?

I can't say anything about average score but they designed
the test in a way that successfully guessing the correct answer
repeatedly would be very hard to do. In other words, you most
likely earned the score you got...

Like every other test, it IS possible to answer all questions
correctly... but not many will.