UC application ap scores reporting

In the AP Exams section of the UC application, we have to report which ones we have taken, and will take this year. I am currently not taking AP lang, but am considering whether to take its exam. If I report that I will take the exam on the application, but when May comes around I decide to not, does it matter? Thank you.

No. AP scores are for college credit only. If you choose not to take the exam, then you will have no college credit.