Conversation so far:
Where did Pierre Boulez begin Pierre Boulez's musical education in 1943?
Paris Conservatoire.
What was his primary focus?
advanced piano.
Did he write any pieces during that time?
CANNOTANSWER.
Did he receive any special recognition as a student?
In June 1945 he was one of four Conservatoire students awarded premier prix, the only member of Messiaen's class to achieve this distinction.

Question: What did he do after winning that award?
Self-contained rewrite: What did Pierre Boulez do after winning premier prix?