Grades Please answer immediately?

My science teacher is not very fond of me. I did a brochure on cleft lip and palate and she gave me an 88 its a B but i think i deserved higher she also handed out a study guide for a test so i answered the questions on the guide but on the test all of the questions were ones that i dont remember seeing in the book. test count as 60% of our grade and i think i got at least a 75%. Now for the first time i might have a C on my report card i have 1 week of school left can i bring this up. will high schools care about this i am only in 8th grade. PS: if i have an average of 90% and scored a 75 on my test and an 88 on my project and got a 100 on a worksheet what would my average be. Remember, test and projects both equal 60% and other work counts as 10%