No. Oppo A5s does not have the 5G network support.
Yes, Oppo A5s does have the virtual gyroscope sensor.
No. Oppo A5s does not have the dual front camera but it has the dual rear camera set up.
Yes, you can play PUBG on Oppo A5s. We recommend you to buy 4GB RAM variant of Oppo A5s for the better gaming experience.