GeForce GT 120M is a middle-class level GPU of the 100M Series released by NVIDIA, in 2009.
Since it only supports DirectX up to 10, games that use DirectX 11 are not supported and unplayable.
It uses the architecture 'G96b' same as GT 130M but also same as GeForce 9600M GT. It can be addressed as a slow GeForce GT 130M, due to the lower clock frequencies or a renamed GeForce 9600M GT, manufactured at 55nm, instead of 65nm.
Very demanding games like Metro 2033 or The Witcher 2 are most probably unplayable, even at the lowest settings, while demanding games like Crysis 2 and Skyrim V can be played at low settings.