Said I would send a subject test score, but don't want to anymore

On the extra comments section of my UC application, I said I was going to be taking the physics subject test. The problem is I didn’t do as well on it, so I don’t want to send the score.

What do I do? Will it look bad that I said I would take a test but didn’t send the score? Is there anything I can do about it?

Thanks

I would let them know not to expect that score. Are you able to retake the test?

I can’t retake it