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1. Since your tablet does not have any Google apps (gmail, play, hangout, etc.), then it most certainly not a Google approved device. For simplicity sake, you cannot install apps from Google Play but can install apps from any other android market (i.e. Amazon)
2. Reset by going to setting>>Backup and reset>>Factory data reset.
this may reset to default factory setting. It may differs a bit in your device, but basically you will find it in Setting. I assume that the pinhole with 'reset' marking is used if your device hang and you need to restart it (=reboot).
3. If you just want to read PDF, just install Adobe Reader. It's free, fast and should be easy to find.
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