Back off on your game settings until the tearing stops, not capping. Move setting back to medium etc one at a time until its playable. GTX 770M is a few generations old, only about half the 3D marks scores of the lowest 965M. Recommended graphics for WOW is an 8800 GT desktop card that a 770M cant even remotely compete with.
The G750JX is not G sync compatible, no download will change that.
The real fix unfortunately is to retire your machine and take the plunge into more recent technology.

“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein