Cancel SAT subject test marked as planned on UC app?

I just submitted my UC application and wrote that I planned to take the SAT Subject test for Math 2 in December but now I’m thinking I’m not ready and don’t want to take the test. Can I change my application to delete that this “planned” subject test was not taken?

Also is there a lot of Geometry on this test? I haven’t had Geometry since 8th grade and I don’t remember any of these geometry theorems anymore!

Help!

And if I do take the test tomorrow morning and it’s as bad as I think, can I cancel my scores or will I *have to report them since my application says “planned “ math 2 test to be taken in december?