In the mid 1930s, the People’s School struggled with the lack of space for children to learn. Some lessons were also held in the old organist’s house and in the Municipal Office. Finally, a committee was formed to build a new school. Local farmers who had carts at their disposal brought gravel, sand and stone. As a result of high unemployment and poverty, the inhabitants offered to work on the construction instead of paying farming contributions. Every day, dozens of people worked on the construction site. On 1 September, 1935, the corner stone was consecrated by the local parish priest, Fr. Franciszek Żak. In November 1935, the walls were ready and the construction of the roof began. In 1936, the building was finished on the inside. Classes started in the new school on 18 January, 1937 and continued uninterruptedly until the outbreak of the Second World War, when the building was occupied by the Nazis and used exclusively for German pupils. After the War, the village was divided into several districts and consequently, the school building housed two schools: no. 1 and no. 2. This arrangement lasted until the completion of the construction of the new Millennial School. Between 1973 and 1984, Kozy had its own Collective Community School, with forms 1-4 in School no. 1 and forms 5-8 in School no. 2. This division was maintained until 1993 when the new K.K. Baczyński Secondary School was opened in the extended part of School no. 1.