This is the 14432nd most frequent Turkish word.
ortaöğretim
"Ortaöğretim" means "secondary education" in English.
In this sentence, 'ortaöğretim' specifies the level of education, referring to students in secondary education, equivalent to high school.
Ortaöğretim öğrencileri bu yıl sınavlara hazırlanıyor.
The secondary education students are preparing for exams this year.
Here, 'ortaöğretim' identifies the context, which is the institutions involved in secondary-level education.
Ortaöğretim kurumlarında matematik her zaman çok önemli bir ders olarak görülür.
In secondary education institutions, mathematics is always seen as a very important subject.
In this usage, 'ortaöğretim' denotes the entire secondary education system as an educational stage in Turkey.