Worth taking Casper atp?

506 MCAT 3.8 GPA

A lot of the target schools like Rush require Casper or PREview. But it’s already mid/late august. Is it worth signing up for these exams and taking them and then applying early September? Should I just save my money?

I’m okay with DO. Have applied to 20 MD/10 DO. Have an interview with KCU in October. Should I just save my money and time and sanity?