panicking... april 11 LSAT

I am terrified to take the LSAT. I was sort of pressured by people around me to take it early and I just did terrible on another PT. I succeed strongly on drills (12/12s!!) and then completely bomb PTs. It's been this way with little improvement for over a month now. I'm in my undergrad as well. Part of me thinks I can just jump 15 points in a week... but the logical part of me knows that's not possible.

Should I just wait? Is it bad to have a bad LSAT score on my record if I take it again and replace it with something better? I just feel like the choice is out of my hands at this point. My parents want it done ASAP. I'm trying to do well while simultaneously doing school and I am just a ball of anxiety.