The cheek of it, Cyber power calling a Pc built with an FX 6300 amd Cpu, 8gb of ram and oh lordy ! a 1 GB Nvidia Geforce 610 graphics card calling it a CyberPowerPC Gamer Ultra Gaming PC.
That is Laughable so say the least.
No dig at you in anyway Bojanduo, or your son.
But more of an annoyance in how cyber power have the inclination in pretending it`s a ultra gaming pc.
As for upgrading.
Cpu wise again I would opt for a FX 8350 cpu with 8 cpu cores vs the current FX 6300 cpu in the system as it stands.
And as said I would double the amount of 8Gb of DDR3 memory to 16Gb.
I would though if you have not opened up the side of the tower case first check to see if the motherboard fitted or used in the system has four DDR 3 memory slots to add another matching pair of 2 x 4 Gb memory sticks.
The upgrade to a Nvidia GTX 1060 card will as said by the other poster greatly improve the gameplay of games your son intends to, or wishes to play.
It might also be worth just having a look at the current power supply unit also in the system as it stands Bojanduo.
Just to make sure that along with the other upgrades mentioned for Cpu and graphics it is enough to power the whole system adequately.
So if you could find out how many watts the PSU quotes it can output here on the forum we can tell you if it will be ok with the system upgrades to power them, or if you will also have to consider buying a new one with more wattage output ok.