I am confused between 2 laptops
1- Asus x555la :4gb ram,500gb,intel hd 5500 graphics
2- dell z565166HIN9: 4gb ram,500gb,amd a6 quad core
Which one to buy for college & gaming use ?
I would install only one game that is GTA 4
For gaming I'd highly recommend a dedicated GPU. Even a GT 920M or R7 M260 is far better than both HD 5500 graphics and R4 graphics
One of the biggest problems of dGPUs (besided poor performance) is that they utilize part of the RAM as VRAM, if that laptop has 4GB you will end up with 3.75GB as maximum due to 1GB is reserved for the iGPU so performance will decrease even more. Nowadays most of low end GPUs have 2GB of VRAM so you are ready to go with them even though you only have 4GB