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If you're going for a sign language, I'd suggest not using declensions. Stay away from the sibilants and probably any voiced sounds if you're going to use it to speak quietly. I can't imagine you'd want to be overheard.

I'd suggest sticking to a word order similar to languages you already speak; SVO would probably be good in your case. I'd stay away from more complicated verb tenses; the subjunctive past is best to be avoided.

Another idea I have is a very simple kind of sign language that is basically inconspicuous; spelling stuff out by tapping your fingers on your desk. So the letter 'A' could be tapping your pointer finger, 'B' on your middle finger, and so on. Past the first five letters, you'd start using two fingers at the same time and so on. There's 24 possible combinations on one hand; enough possible finger combinations for all of the letters which you'd really need (you could take out letters like 'q' and 'x' and replace them with 'k' and 'ks').
If you went into two hands, you could have all of the letters, all of the numbers, all of the mathematical signs, and a good number of basic words. 3nodding

This would be completely undetectable to other people; it would just look like you were fidgeting.

I've never tried anything like this, nor would I these days, for in university the risks of getting caught cheating (like, getting expelled from the uni.) is far worse than failing a test.

However, I will agree with Eccentric that the tapping signals would be most inconspicuous. I've had classmates that did that. But they only used it on mutliple choice tests, so it was very simple.

Oh, you're here too, Da Nuke. I would not approve of cheating, but tapping in that way, or in a way like morse(sp?) code would be a way of communicating. That way they could just listen rather than sending a bunch of glance at your hand. Or use both, so it is less conspicuous. One more thing: DON'T CHEAT!

No, art is a science. If it was an art, I wouldn't be good at it. Math is logic and science.

Trust me, he does his own work and has showed me like 30 pages full of math scribblings, but I do it because he just can't keep up... he sometimes even forgets l'Hôpital's rule, which is really ******** simple. He even takes private lessons from a teacher. The thing is, that he just can't keep up.

If he really wanted to pass, he would pin-point his problems and overcome them in anyway he can, excluding cheating.

Yes they are. I'm tired of people saying they can't do thing. Somethings maybe harder, but they are never entirely out of your reach. It's like that whole thing with this so-caled "writers' block" - it is an excuse. The only way you could possibly be stuck in a story is if you corner yourself. Samething in anything else. The only way you can get trapped is to trap yourself, and the only way to trap yourself in most subject, including math, is to not try hard enough. I have problems with languages, but if I actually bothered to try, I could learn. The simplist thing in the world is always defined by pop-psycologist as hard. Just do it and keep at it. Choices are hard, acting and continuing to act is not.