How do you get good grades if your stressed to your limit?

Your lack of sleep is adding to your stress which makes it hard to sleep. A very well known but nasty self feeding cycle. The other responder is right about setting priorities but you need to make yourself sleep at night in order for the rest of it to work out in the first place. Top priority is to set yourself a bedtime and stick to it, If you can not shut your mind down enough to go to sleep you will need an over the counter sleep aid for short period of time until your body adjusts to the rest time schedule. There are natural OTC meds which are very effective if you dont want to use drugs. There are also other things you can do to help fall to sleep besides medicine, but that varies from person to person, so if you dont know what works for you, consider posting a question in here asking what other people do to help them fall asleep. For me personally, a cup of warm cocoa will do it every time, others swear by warm milk but I dont like that. You may be the type person who is easily distracted or you just may have to much to do in your schedule. There are a lot of possibilities, but getting enough rest must be top priority in order to get things to a managable level. Your school councelor is a good person to talk with about these types of problems. Rest comes first followed by time management and prioritization of activities. Good Luck!