I start my first day of Senior year (high school) today. I screwed up my biological clock, and combined with anxiety, I cannot fall asleep with ease. Would anyone care to offer advice that I may need for this year?
The trick is to remember that breathing out is just as important as breathing in.
This is something that I tell all of my students: your ability to recall information is probably only the fourth most important skill. The first three are managing your physical, emotional and mental well-being. That means eating regularly and eating healthily, getting a decent night's sleep, maintaining positive relationships with family, friends, peers and teachers, and allowing some time to yourself.
You need to establish a routine, and the first two weeks will be the hardest. Go to bed at the same time every night, and wake up at the same time every morning. Exercise both your mind and body; if you're having trouble sleeping, chances are you have too much physical energy or your thoughts are racing. Sleep is much easier if you are both physically and mentally tired. If all else fails, camomile tea can help relax you.
Don't push yourself too hard. The temptation is there to double down and study harder and for longer, but I know when my students have gone to bed at two in the morning and I know that their attention levels will suffer for it (especially in my subject area, senior English literature); short-term gains bring about long-term losses. You have to pace yourself. Likewise, if you get a mark that you're disappointed in, don't marginalise it and pretend that it means nothing. Ride the emotional storm out. Sure, you'll feel like crap, but it's better that you get it out of your system now than to bottle it up and have it explode at the worst possible moment.
Your teachers are a resource. Use us. If you're in my class - and you aren't; I'm on the other side of the world - I would rather you come to me now if you feel that you're struggling than later when things are getting serious. The sooner you come to me, the more opportunity we will have to get ahead of the problem. If you come to me later, there may be very little that I can do and chances are good that it will be an autopsy of your last assessment task.
A first draft is never a final copy. As a senior, I would expect you to go through at least three drafts for each essay.