Do you have any sense of what happened? Did you run into timing trouble? Were you out of energy? Sometimes this happens if you haven't been practicing with full CATs (essay, IR, strict timing, no pauses). Was there a particular element of the verbal section that you struggled with?
In any case, given your home performance, you
know you can do better, so there's no reason not to try again. Identifying what went wrong will just give you a better sense of what to work on between now and the retest.