She oversees the marking of thousands of VCE geography exams, which are scrutinised by an army of assessors in homes across the state.

"The general public doesn't realise what is involved in developing and assessing a year 12 exam paper. They really don't," Ms Wiber said.

The retiring chief assessor for VCE geography has witnessed huge changes during her 21 years in the role.

Countries have been renamed and their borders have shifted.

Exam marking has moved online and students' handwriting has deteriorated.

"It has certainly gone downhill," she said.

But rest assured, sloppy handwriting does not lead to lower marks.

"This year I have marked a few exams where the handwriting has been less than ideal. But they have done extremely well because they knew their geography."

Ms Wiber said students' responses to exam questions have improved.

"They are writing in far greater depth and it is far more complex. They are using data to justify their responses."

Chief assessors rarely give interviews and have to follow strict rules.

Ms Wiber, who teaches at Mentone Girls' Grammar, is banned from teaching Year 12 geography students because she creates their exams.

Students at the independent school joke that they always know where Ms Wiber has travelled, because her holiday snaps have ended up in the geography exam.

She said the Victorian Curriculum and Assessment Authority went out of its way to make exams accessible.

One year, it painstakingly created a 3D model of a map with rocky mountains for a blind student.

Ms Wiber has dictated details of maps into a microphone at a South Melbourne recording studio, with the audio played to vision impaired students sitting the exam.

"If you've ever had to describe detailed world maps, it is a very daunting experience," she said.

Provisions have also been made for sick students, who have sat exams in hospital beds and even on a mattress on a classroom floor.

Unlike the VCE history exam, which accidentally included a phantom robot in 2012, there have been no major controversies involving the geography exam.

"We are a pretty professional team in geography and we put an incredible amount of time into the preparation of the exam paper," she said.

Assessors work in pairs, and if the difference between their marks is too great, the student's paper is sent to a third assessor. If an agreement is not reached, it could be sent to a fourth marker.

"We really want to make sure that students get the marks they deserve."

Students will receive their VCE results on December 14.