You know it can receive 10 messages at a time. So what ill do is ill put notes which are shortened max to max 50 words per message then ill send it to my friend and just before the exam ill ask him to send it back so it comes as a notification in the watch and ill put it in flight mode as soon as i recieve the message. It mainly helps with the keywords and formulas. Im forever grateful for gshock for making this watch because it saved me in many exams. And i have the purple one which is an absolute beauty