HSC exams in bushfire-hit areas are being disrupted with students urged to put safety ahead of their studies.
More than 12,600 students are scheduled to sit ancient history and foreign language exams on Friday afternoon.
But exams have been interrupted by intense bushfires ravaging the state.
Students should not take risks to get to an exam, Education Minister Adrian Piccoli said.
"The first priority for every student is to make sure that they are safe," he told AAP.
"No one should take any risks in order to get to school or an exam today."
Those unable to get to their exams because of the fires should apply for special consideration, he said.
Winmalee High School and St Columba's Springwood in the Blue Mountains are closed, as is Lake Munmorah High School on the Central Coast.
Springwood High, Lithgow High and La Salle College are all open for HSC exams at this stage.
Winmalee students are being advised to go to Springwood High School and St Columba's students to McCarthy Catholic College in Emu Plains.
Students at Lake Munmorah are urged to contact the school for advice on alternate arrangements.Students in bushfire zones sitting afternoon exams are being urged to contact their school principal after 11am for the updated advice.