According to a survey done by the American Psychological Association (APA), 45% of teens said they were stressed by school pressures. Students become stressed from the environment around them (homework assignments, social life, perceived parental pressure, etc) creating a detrimental effect on their mental health. In an article written by Patti Neighmond, she explains the dangers of chronic stress. She mentions that Mary Alvord, a clinical psychologist for the APA, says that chronic stress can cause a sense of panic and paralysis.
https://www.npr.org/sections/health-shots/2013/12/02/246599742/school-stress-takes-a-toll-on-health-teens-and-parents-say
In an article published by the Mayo Clinic, they say,"The long-term activation of the stress response system and the overexposure to cortisol and other stress hormones that follows can disrupt almost all your body's processes." This increases one's risk of developing anxiety, depression, headaches, sleep issues, and heart disease.
https://www.mayoclinic.org/healthy-lifestyle/stress-management/in-depth/stress/art-20046037
While chronic stress should be avoided, it is important to note that not all stress is bad. According to an article published by Summa Health, eustress is the stress one feels when he or she is excited; this stress is short-term, it inspires or motivates individuals and it enhances performance.
https://www.summahealth.org/flourish/entries/2021/01/stress-management-how-to-tell-the-difference-between-good-and-bad-stress
It is true that school presents multiple stressors in a student's life that has the potential to take a toll on that student's mental wellbeing. While some stress is beneficial, chronic stress should be avoided. Students are encouraged to maintain a balance of the two by taking mental health breaks.