I understand the anxiety part. I have very severe performance anxiety. A piece of music that I had memorized completely, that wasn't difficult for me, that I've played hundreds of times with no problems, I couldn't play at recital at all. It's a similar reaction to when you're in the middle of a disaster, and people just freeze because they can't think of what they need to do to escape in that moment. I don't even know what you'd have to do to overcome that, to make your brain work again. I'm just fortunate that I've never been afraid of taking tests. <br><br>It's also interesting about the IQ and anesthesia. Here is a personal anecdote.  My IQ is 135 (Raven's matrices) and in my experience, pain killers tend to wear off extremely fast on me. When I was giving birth, the epidural stopped working after 3 hours. This has been true for all mind altering substances I've tried. I'm a small person who gets drunk after drinking only one beer, but it takes me only 15 minutes to sober up completely. I've always thought this was due to my high metabolism, but maybe IQ has something to do with it.,(reply>), My score is slightly higher than yours and I do NOT sober up that quickly. I have also never met a math, physics, comp.sci., or linguistics student who did…<br>Never tried any other drugs than alcohol, coffee, tea, cocoa… but those I’ve known who did certainly didn’t seem to recover faster if they were smart.