VOICS handed over Christelijke Mulo to BPPK-THKTKH, and then it became Petra 2 Christian Middle School, with the school principal Mr M.P. Guarantee.

The Tiong Hoa Kie Tok Kauw Hwee Education and Teaching Agency (BPPK-THKTKH), founded by seven Christian figures from the THKTKH church, opened junior and senior high schools in the evening (evening school) by renting five classrooms at Christelijke Mulo owned by VOICS (Vereniging tot Oprichting en Instandhouding van Christelijke Scholen) on Jalan Embong Wungu, Surabaya. These later became Petra 1 Christian Middle School and Petra 1 Christian High School. The principals of these two schools were Bhe Hok Liong.