In our laptop when we open the system proporties there we saw that our gaming graphics or graphics us 1.0determined as lowest graphics because of which in our laptop none game will work
You have a laptop, so there is no way to increase your graphical performance. Sorry. The only way to improve graphical performance is to get a new computer.
Sorry man, but you have a laptop. On laptops, the graphics card/chip is soldered onto the actual motherboard itself, so you can't upgrade it. Upgrading graphics cards is only for desktops. So, unfortunately, your only option is to buy a whole new PC.