I’d study for the next few weeks and see if your practice exam scores improve- I know for me if I had taken a practice test without studying, I would’ve scored really low because so much of it is things that you learned forever ago- like 6 years since I took the relevant math courses. Of course you can’t be expected to score amazingly with zero prep on things you learned forever ago! My scores on the real thing were also significantly higher than what Magoosh had predicted for me since I did practice questions throughout as I relearned the material, but it was still factoring in those old questions I’d taken just to see if I remembered anything. I’d check whatever is the latest date you can reschedule it to if need be (scores only take a few weeks to be fully released so there’s no worry about taking it a bit later if need be), study well, and see how your practice tests improve. If you’re still not happy with your projected scores by the time you’re about to take the test, I’d postpone it a bit, but I think you’ll be surprised at how much you can relearn and improve in just a few weeks!