Do MIDTERM GRADES matter?

I am senior in high school and I’ve sent my mid-year report to colleges.
My AP Calculus Final Grade is B (my school dosen’t do B+/-), but my midterm grade is D.
Do you think this would affect me a lot? I do not know why I messed up my midterm so bad but I am so worried about this right now…

You do not state which colleges you sent your Mid-term report to, but most would consider a D or F, a reason to rescind. I would contact your GC first, figure a plan and then contact the schools to see what can be done to remedy the problem. Most schools DO NOT want to rescind, so most would be willing to work with you. Take care of this ASAP.