Nine-year-old Kazimierz Serocki plays the first part of Joseph Haydn’s Piano Concerto in D major during a concert featuring pupils of the Pomeranian Musical Society. The poster announces him as a pupil from Professor Lisicki’s class. Zygmunt Lisicki – highly regarded pianist and promoter of music, who was active in Pomerania and Cuiavia – must have been Serocki's official tutor.
Kazimierz Serocki continues his musical studies in Bydgoszcz, where his teacher, Maria Drzewiecka, has moved. There it takes him just two years to complete a high school of music piano course. At the same time he attends a grammar school in Toruń – Liceum Ogólnokształcące im. Mikołaja Kopernika.
Kazimierz Serocki completes his secondary education, receiving his grammar school diploma from Liceum Ogólnokształcące im. Mikołaja Kopernika in Toruń. In most subjects his grades are good (Polish, French, history, geography with geology, physics with astronomy, and mathematics) or very good (religion, philosophy, military and civil defence training, as well as singing – an optional subject). The worst grade he gets is in chemistry.
In the summer Kazimierz Serocki gives his first major public performance as a pianist. The performance takes place in Ciechocinek as part of a Polish radio broadcast series; Serocki plays works by Ludomir Różycki.
Kazimierz Serocki performs during a concert of the Bygdoszcz Music Conservatory. This is how a reviewer describes the event in Tempo Dnia (21.06.1939):
The primacy went to the peerless Mr Kazimierz Serocki, who in Beethoven’s Piano Concerto in C minor displayed considerable talent as a pianist as well as full understanding of the style of the work, profound sense of phrasing and mastery of the instrument.
Kazimierz Serocki takes part in a military and civil defence camp in Lidzbark near Działdowo and works in a squad constructing fortifications. After the outbreak of the war the whole squad including Serocki withdraws to Warsaw.
On the day Warsaw surrenders Serocki decides to return to his parents. First on a boat on the Vistula River and then on foot, he manages to get to Toruń, which has been captured by the Nazis. He spends the first months of the occupation with his parents in Solec Kujawski.