Colleges don’t look at middle school grades unless your district puts 8th grade scores on the high school transcript. You may want to ask the high school guidance counselor about this. Some high schools apparently do use 8th grade scores in GPA calculations, but colleges usually won’t use your 8th grade scores in calculating your GPA.
See this previous thread: http://talk.collegeconfidential.com/high-school-life/1782877-do-8th-grade-transcript-classes-affect-high-school-gpa.html