Helpless in a Test/Quiz

I took a quiz today. I didn’t study extremely hard, but I did study enough to know the main thing the teacher told us to study. She gave us a study guide. I looked over every single bullet. I get the test and there are about four questions with main ideas nowhere to be seen in the study guide. I hate feeling the helplessness of not knowing the answer to a question. The feeling where you are totally clueless. You know you’re making a blind guess, but you still take 15 minutes guessing on that one question.