you probably won't like me cause i make those immature puns all the time (only with the freshmen friends of mine though)
(general anti stress)
just play a violent videogame
it vents stress without bringing harm to others, listen to music, read a book, find a fad and get entranced by it, read a funny webcomic,
or watch some television
pick your anti stress poison
(parental anti stress)
Hang with some friends then or discuss politely and in an intelligent fashion about what you want to do about the parent situation, with the parents, if that doesnt work then read above methods
(bad grade anti stress)
Study hard, or my own personnel but not assured to work method
cram then sleep, you remember lots of things when your in dreamland
P.S. Second Quarter is always the hardest quarter, third quarter is still hard but manageable, and 4th quarter is just tests