Mumbling to yourself should be ok, but if you do it too loud they might think that your trying to help someone cheat. I'd say just sit in the back corner on the classroom away from the proctor and when they walk around(as they do) dont worry about it unless they same something and if so just be honest. If it makes you feel better you could inform them of it prior to the test, but I doubt that it'd be needed unless your worried that you'll shout out like terrets.
They make you sit desks spaced out with open desks inbetweeen anyways to help reduce cheating, so with any luck the guy next to you wont even hear you. If you stress about it, it'll lower your score due to needless worry. Just relax and take the test bro.
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