This group of kids in my science class.
Not to be rude, but that's not a pet peeve. A pet peeve is an action by another person(s) that you can not control, which in turn causes you to feel annoyed and irritated.
I've mentioned numerous times not to hate on groups of people in this thread, because that's not a pet peeve.
A better way to word it would be to write something like "the way this group of kids act in my science class" or something similar (though I still don't see how that is a pet peeve, something more along the lines of "annoying people" would be more appropriate).
If you're going to at least dis a group of people, at least try and justify why. Especially with this example, saying "this group of kids in my science class" has no relevance to a pet peeve. It basically seems that you're saying their existence makes you annoyed, which is rude. At least put effort into justifying your reasons by adding something like "they keep disturbing the lesson and it's annoying"
OR BETTER STILL, don't directly mention anyone, simply just say "people who disrupt class".
As I've mentioned before, there's a fine line between a pet peeve and hating on someone, and this, yet again, crosses that line.
CHECK URSELF B4 U WRECK URSELF