Yes, I figured that at school teachers start at the very basic level, hopefully soon he will switch to some other render (mental Ray no longer exists)...maybe Arnold.
Just revise your shaders to zero reflection, maybe the window glass only could have reflection, your glass shader is somewhat wrong, I'll send you a better value shortly.
I know this is a bit on a cartoon side but just keep in mind that in real world ...or even cartoon world ...specular should always be white, that's how materials are in reality, the only one that changes the color of the specular are colored metals like gold, that's the most common example.
You'll understand better once you start dealing with physical shaders eventually.
For now set your blinn glass to Eccentricity .05 , glass has sharp specular highlight, like shinny plastic....set Specular roll off all the way to 1.
Reflectivity should have a facing ratio with a ramp, but that's a bit more advanced, ask you teacher about that in a few weeks....this is very common in Maya shading networks.
