stress??

It's my third day of period and I think my stress has something to do with my problems in school right now.
I have been doing well in school until my english grade went from high As to low Ds because of the quiz I thought I did well but ended up actually doing bad. 
I also checked my french and history grades and I am in high Cs, but my parents don't like seeing such grades like that.
I am worried that I will just explode inside and not feel anything. I don't have anybody to control me (I don't like people controlling me but this time, I really need somebody to tell me what to do so I can adjust). 
What's your advice? What should I do?

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