I am currently a sophomore. On my first semester grades in my freshman year, I got a D in one of My classes. Will the D in my report card affect any chances of getting into a UC school?
It will depend what class the D grade is in. UC’s allow grade validation for Math and Foreign Language, meaning if you pass 2nd semester with a C or above, it validates the D 1st semester or a Higher level Math or FL class will validate the lower level classes. See matrix link: http://admission.universityofcalifornia.edu/counselors/files/validation_matrix_math_lote.pdf
As long as the minimum a-g courses are met, you are fine to apply. The caveat is that if you do not repeat the semester, your D will be calculated into your UC GPA which is only 10-11th grades. Your GPA could hurt your chances at the mid and top tier UC’s.