i have been summoned...haha
this has been my problem since i was born
there are good ways or expressing perfectionism...and there are bad ways (i have done both haha)
i know it's a extremely rigid lifestyle, where everything has to perform in your life (at least thats how it was for
to the extent that i had anorexia for three years to exemplify the 'being perfect at everything aspect (even self control!) .
One thing i will agree with what the human on top of me said, is that there are good ways to channel it. One example would be to use it to get better grades. The pitfall of this arrives when you get a bad grade, or there is a lot of pressure. I don't really know about your kind of perfectionism, but when i do badly (in my eyes i pretty much failed at life). if this is what happens to you: YOU DIDN'T.

In terms of copping, breathing is one method (i know, i'm telling a human who already breathe's, to breathe haha) but just deep breathing, and relax! (or try to)
also talk too friends/other humans. they really help! like a few days ago i had an exam, and i was so scared about it (about not living upto my perfectionistic 100% on every test, completely unrealistic standard tbh). so i put it up on AN (the class of 2016 one). this really helps, because then you have humans to talk to who kinda understand what you are going through, and it really makes you feel better!
other things that i also do is shower when u get stressed (hot water is a miracle

) and exercising works too. General idea is maybe do something else for like 15-30 mins if you get too stressed about things.
Advantages of perfectionism are many- as long as you channel correctly

Good Luck and I hope this helps

Maryam