I'm certainly not an expert at this, but I am in the same boat. I'm scoring well on preptests, but I still feel pressure to keep working at it up until the 11th hour. Im going to do a preptest/review the answers each day between now and saturday. Saturday I'm going to do a final review and some practice questions, and thats it. Sunday im going to relax, drive to Delaware from Baltimore (only test center left when i registered) and stay there overnight.
IMO, I think you should keep taking tests this week if it will make you feel more confident and prepared, but give yourself at least the day before to relax and decompress. You dont wan to go into the test center on Monday feeling burned out and drained from a test the day before.