gpu change

You don't have a chance in hell of changing the GPU's inside laptops. They are soldered onto the main board so you're better off buying a laptop with discrete graphics or building yourself a desktop.

all i have to say is check it out first before you make the purchase.

Its not a physical card, if its the integrated Intel graphics then the graphics units are part of the chip set which is soldered onto the main board.
Geve us some info on your laptop like processor, graphics, ram... ect.

You can change the entire mobo if there is a mobo with better graphics.
but other than that your out of luck.

you would have too change most of it to have decent performance

The processor its self is more of a bottleneck. Just invest in a new system.

What kind of games does he wanna play?