It is a weak graphics chip so you need to have pretty low expectations.
If there is an existing that you want to play, then in youtube you can do a search for "nvidia 820m" and the name of the game to see if anyone recorded the game.
The only other advice I can give you is to save up more money for something that is more powerful than a nVidia 820m or similar AMD graphics chip.
The link to Notebookcheck.net in my 1st post contains some game benchmarks.