When talking about your suspension, make sure that you mention what lessons you have learned and how it has changed your life inside and outside the campus.
Never say things like "it's the fault of my brainless classmate" or "it's because the teacher was inconsiderate" when providing details on your high school suspension.
Colleges do not care about your grades, conduct, and other matters before high school. When applying to a college, your high school performance is the only thing that matters.