Contrary to what you think that placement test SHOULD be prepared for. Usually you get two attempts. Study and retake. Make sure you’re ready for the placement test this time.
Starting so behind in math means you won’t be able to start on your pre-med pre-requisites till sophomore year and you’ll be blocked from taking classes for various majors; if you have a time frame to complete entrance to major you may well be stuck because those credits push you out if the allowed time frame. What do you want to major in?
Starting in a class other than College Algebra or calculus1 is one of the main reasons for students being held back and never graduating.
In a nutshell, never take a test (placement or otherwise) without making sure you’re ready to perform .