Hey Yashiz,
So I am in the process of updating our Mac for testing as ours shares the same Nvidia 750M as your machine. I did run a quick test on my end to compare the expected/correct results to what you are seeing on your end.
Windows (DX11) (SM5)
This should be how it looks in a new default scene using the Advanced_Lighting map from Starter Content. Let me know if you have further questions or need additional assistance.
Cheers,