Simple, use the large cloth as a sail, attached to the pole, being careful not to capsize the vessel. If the watch is analogue, you can use the finger method to get the time, and use the shadow of the needle to get a bearing, though you may have to wait. since you do not know where you are, it is most logical to follow the wind, looking for signs of civilization like other ships and buoys. Drink only when you have to, and don't eat to conserve water, at night, use the cloth as a blanket, stop procrastinating about studying for your exam.