Tonya,
I am not sure you can overstudy, but in my experience, anxiety can cause you to do non-productive studying and just scramble a lot of information. You should stop when you have reviewed the domains and each subsection and feel comfortable with the information. If you have identified areas of weakness, you may want to go back to those areas. Most of all, it is best to take a deep breath and tell yourself you've got this! No one answers every question correctly! Believe in yourself!
Sandi
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Sandi Delack MEd, BSN, RN, NCSN-E, FNASN
Executive Director, NBCSN
sdelack@gmail.com------------------------------