Re: "Why is it stupid, and have you not learn anything?"
If she said that her grad school courses are stupid, then you should ask her "Why are they stupid? Are you not learning anything?"
I would use the present continuous in the second half because, presumably, she is still attending those classes even if she thinks they're useless.
I'm not sure what your friend means by her courses being stupid. Stupid is usually a human attribute although we sometimes use it to mean that something is rubbish or that an act was senseless.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.