The triumph of Pitman was a triumph of business organization: there was a weekly paper to persuade you to learn Pitman: there were cheap textbooks and exercise books and transcripts of speeches for you to copy, and schools where experienced teachers coached you up to the necessary proficiency.
There are no more uses of "proficiency" in the play.
Show samples from other sources
Not as well as my mother, but I’m pretty proficient."
Kiera Cass -- The Heir
Yvette was by far the most competent of my coworkers, and she and I would often work together on any electrical job requiring proficiency with tools.