Re: doctor
Welcome to Android Central! Did you buy it new, or was it a floor model, or used? Look through Settings>Apps>All--do you see anything called Demo Mode? Or look through all of the other system settings for some sort of demo setting.
If you can't find anything, then it's probably baked into the firmware. You'd probably have to root the phone and look for a custom ROM to install. You can search the web for "ZeePad 7DRK root ROM" to see if it's possible.