I get restless legs because I have nerve disorders. Basically what helps me are warm showers or some of that heat releasing cream & to have opportunities regularly to be able to walk around a bit. The exercise really does regulate the muscles so that the synapses stop misfiring as often. If you're USING the muscles, it gives them less of an opportunity to present you with an unpleasant sensation. Tell your teacher about your restless legs & possibly request a seat near the back so it's not as much of a disruption. And when you have to stay seated, just bounce your legs or tap your feet. That's about as much advice as I have, other than stuff like low doses of klonipin or ativan. Those are notorious for not helping with concentration :P