John began his education in 1912 at a public school. From 1919 he continued to educate as every child in Korcz's family in a teacher's seminar, which he completed in 1925 due to unsatisfactory math's grades.
After passing a matura exam with his brother Jozef, he went to Warsaw to study art in the Wojciech Gerson's School of Fine Arts. After a holiday in his family house in 1933, he and his two brothers returned to Warsaw to study at the School of Fine Arts and the State Institute of Handwork, while working in Grochów.
In 1937 he went to Paris to continue his self-education in Fine Arts.