Grade drop

Hi everyone!
I’m very upset at the moment.
I am a senior in high school and one of my grades has dropped significantly this term.
I’ve always been a good student, but this year truly hit me. Currently, I’m B-ing my Multivariable Calculus class and I don’t think I can get my grade up this term. I am applying as a Comparative Literature major, but this is still very concerning.

How bad is this grade drop for competitive colleges like UChicago, Dartmouth, UCLA, etc.?

For UCLA, you need to maintain a 3.0 unweighted GPA with no more than 2 C’s to keep your provisonal admission. You will be fine with a B in that difficult class. Also UCLA does not ask for a Mid year report of Senior grades so it will not impact your chances for admission.