So as of this tream, Raz's psychic education consists of

Basic Braining with Oleander: Pretty standard all things considered, everybody gets this, but Raz is apparently the first person ever to actually get to the end of the course.

Private one on one Psi-Blast Training and exploratory exercises with Sasha. He's not the only one to get this, but he's the only one that wasn't scared off by the offer of combat training.

Levitation training with Milla: Again, pretty standard.

And... Well, the selling point of Whispering Rock is a chance to be trained by elite agents of the Psychonauts. Oleander and Milla's lessons are standard, everyone gets those, but the people teaching it aren't.

All throughout this period, Raz is being mentored by Ford Cruller, founder of the PSychonauts, who takes a special interest in Raz and teaches him how to use three different psi-powers.

He gets into the psychonauts intern program, which is implied to be rather exclusive, and learns the explicitly rather advanced mental connection ability from Hollis...

And then learns Time Bubble from Helmut Fullbear and Mental Projection from Cassi O'pia.

Meaning that Raz has been, officially, mentored by the entire "current" generation of the elite of the Psychonauts and half of the Psychic Six.

Raz's dream is to be a psychonaut and he's basically winning at life. He has the power, the talent, and the education to... He's gonna be running the Motherlobe when he grows up.
Spoiler: Stuff that's probably spoilers
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and if there's gonna be DLC or a Psychonauts 3 with new psi-powers, I'll eat my foot if it doesn't involve Nona teaching Raz how to control his hydrokinesis more actively.