I have the same problems particularly when I'm in a public setting, you can go on powerful medications that will cut back on your tics (but the side effects can be dangerous!) or you can try to distract yourself. Read an interesting book, listen to music and focus on the words or listen to classical music, draw or color something, or get into a heavy discussion with a friend.
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Intelligence should be judged on the degree you are able to compute information and translate it back in an intellectual manner rather than by what grades you get on a