so I am super scared. I have a 120 question exam today that is 90 minutes long. I need at least a 50 percent to pass, but I had absolutely no time to study. Its on ALL of US History, so it doesn't help that I don't know what to study. I am panicking, no matter how much I study even if I studied before, I won't be able to understand all the concepts. I have an hour left. What do I do?