Would Roger Zelazny's "Madwand" qualify? I don't want to spoil as it's set in the universe of "Changeling" but later. Suffice it to say, being educated in magic is quite dangerous.

Not for the same reason as in "Rivers of London", where approximately any human can learn some quite spectacular magic, but the force tends to be directed back into your own brain, so most of the training is not to die from the side effects.

Robert Carnegie