Pupils from the primary (1st to 4th grade) and secondary (5th to 8th grade) school levels go to secondary schools. In Bulgaria, secondary education is compulsory. Education begins when a child turns 7, but it is possible to start school at 6, if the parents wish so. Although kindergartens are optional pre-school education which starts at 6 is mandatory and provided by the government. A child can complete their year as a preschooler either at a state kindergarten or at a secondary school depending on the area or preferences.
After 4th grade pupils who go to primary school move on to a secondary school or a high school (8-12th grade). Most schools are state-owned with the curriculum approved by the education ministry. There are private secondary schools as well and many of them offer nursery and pre-school education too.
In Bulgaria, the school year begins on 15th September and ends in May or June depending on the grade.
Useful Links:
Ministry of Education, Youth and Science