Your health and well-being are an important part of finding success in high school!  To manage stress, be sure you:

1. Get enough sleep - The National Sleep Foundation recommends that teens get 8-10 hours of sleep per night to function best.

2. Eat healthy - Teens are rapidly growing and need adequate nutrition for healthy brain and body development.  Check out http://www.aboutkidshealth.ca/En/HealthAZ/HealthandWellness/Nutrition/Pages/healthy-eating-for-teens.aspx

3. Manage your time - Especially if you are involved in a lot of acitivities outside of school, it is important that you budget enough time for schoolwork.  Here are some helpful suggestions: http://student-tutor.com/blog/time-management-techniques-for-teens/

4. Find positive outlets - Spend time with friends, exercise, play with your pet... whatever it is that makes you happy, try to find time to enjoy life.  

For more tips, check out: https://www.psychologytoday.com/blog/the-race-good-health/201402/5-tips-helping-teens-cope-stress and http://www.apa.org/helpcenter/stress-teens.aspx