While not a compulsory subject, although there is a push by the state government to make it so, the subject is still one of the biggest outside of English.

There were plenty of relieved faces at Scots All Saints College, as students poured out of their exam room on Friday afternoon.

"It felt easier than the trials. I felt better prepared because of them," Abbey Miller said.

"I was prepared but a few questions caught us off guard," Tim Powell said.

"Finding motivation after the trials was a bit hard," Will Mitchell said.

Students studying Standard, Advanced and Extension 2 completed their exams on Friday, while students studying Extension 1 will have to wait until Monday, November 4, to finish their Mathematics exams.

There's still just over two weeks of the HSC left, with the last exams to be held on Monday, November 11.

Students across six Bathurst schools are currently undertaking their HSC exams - Bathurst High, Kelso High, St Stanislaus' College, Scots All Saints College, MacKillop College and Skillset Senior College.

Exams continue with Biology on Monday, October 28.