I wanted to know If its possible to change a Graphics Card in a laptop.
In some laptops you can, you will need to check the manufacturer of the laptop, or look it up online. Even when a laptop has a modular video card installed there may still NOT be upgrade paths. Every laptop is different, depending upon the popularity and availability of the laptop model you may find some models with more flexibility.
very difficult many laptops have the graphics integrated into the motherboard. other times the graphics card is proprietary and non-standard making upgrading impossible.