How should I react when my 15 year old daughter gets bad grades?

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quizzes are just gonna piss her off b/c your giving her more work. if she doesn't want to do her work she won't do it. period. she obviously doesn't care about school. i don't wither, so this would almost be coming from her stand point. the best thing might just be to ease off her a bit. my parents get pissed at me when i get a C for chirst sake. and all that does is piss me off when they get mad and when people are angry their i.q. decreases by 18 points.(no, i didn't make that up, you can look up that fact) so ya, just ease off and let her try it on her own, but, if she is obviously not even trying, i would look into getting a professional tutor...