Accidentally signed up for a subject test :(

Instead of signing up only for a Bio subject test, I accidentally signed up for a Lit subject test too. I realized this way too late and the website says that I can’t drop it. Does this mean that I have to just take it and hope for the best? I don’t want to cancel my test scores though, because apparently I would have to also cancel my Bio score (which I definitely don’t want to do).
My best option from what I can see so far is to just do my best on the Lit test and retake it in the fall if necessary. However, if my schedule next year proves to be more busy that I can handle next year and prevents me from retaking and getting a better grade on the Lit subject test, I’m a little screwed.
When sending test scores to colleges, can I choose to not send certain scores? Or will they see it no matter what?

You don’t have to take the test you signed up for! If you signed up to take chem and lit you can take two different subject tests. Trust me lots of people have done this

Just take math or something

Or you can leave the room after the first test. You wont get a refund, and the test score wont be cancelled

Oh so I would get a 0?

No, the test wouldn’t be scored