I have a 518 on the Mcat,failed out of 2 masters and failed some undergrad. classes. Should I start a 3rd masters as for DO or Med. school?

I am 29 and tried all my life to become a doctor. I have 2 degrees in both Biology and Psychology. Here are my stats: Science GPA:3.0 (super scored, failed some classes, but retook them) Overall GPA-3.1 Mcat-518 I have also failed out of 2 master(s&P) programs, but I want to start a new one. with this new... show more I am 29 and tried all my life to become a doctor. I have 2 degrees in both Biology and Psychology. Here are my stats:

Science GPA:3.0 (super scored, failed some classes, but retook them)
Overall GPA-3.1
Mcat-518

I have also failed out of 2 master(s&P) programs, but I want to start a new one. with this new masters, if I get a 3.5 GPA, I am pretty much guaranteed to get into their D.O school(but subject to an interview)

Thoughts?
Update: *should I start a 3rd masters *for DO or Med. school
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