I am a Junior and I just recently got a D in Ap Cal and I had a 4.2 and all the grades for this semester are A’s will UCs accept the D I got in Cal
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If you do not repeat the course, your D will be included in your UC GPA which will impact your chances at some of the top UC’s, yes.
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If you repeat the course, the repeat grade will be included in your UC GPA but you still need to report the D but your GPA will be intact.
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If do not retake, you can still validate your D by getting a C or higher next semester or taking a higher level AP class, but your D will still impact your GPA.
UC’s use only 10-11th grades in their GPA calculation so it important to have competitive grades these 2 years.
https://rogerhub.com/gpa-calculator-uc/
Bottom line, if you are aiming for UCB, you will need to retake the course and get an A.