Scaling is performed by the Technical Committee on Scaling, which is part of Universities Admissions Centre (UAC). It is done so that comparisons can be made between students who have studied different courses. Scaling affects your UAI it is not related to your HSC marks.
Scaling reflects the strength of the candidature in a particular course, by comparing how they do in their other courses. A higher scaling course means that the majority of the candidates attempting that course are more 'academically minded', i.e. they do better, and this would be reflected by their performance in their other subjects. A lower scaling course, however, means that the majority of students attempting that course are not as academically minded, and again, this would be reflected by their performance in their other subjects.
This means that the scaling of a course could change from year to year, depending on how its candidates perform in their other subjects. Scaling should not be confused with aligning.
However, scaling should not be used as a sole factor in choosing courses. The best course of action regarding choosing choices should be to consider the following:
1. The candidate's interest in that subject
2. The candidate's aptitude for that subject
3. Advice from teachers, parents and friends
4. Their school's teaching background in that subject
It is possible to achieve a high UAI with any combination of subjects.
Why do we need scaling?
Scaling allows universities to compare students who have studied different courses fairly.
How does scaling work?
Scaling takes raw HSC marks for a course and changes the average and maximum marks of that course, using a rate developed according to the strength of the students undertaking that particular course. For technical details refer to the Report on the Scaling of the 2005 NSW Higher School Certificate.
Is a courses scaling always the same?
A courses scaling differs from year to year, according to the calibre of students undertaking the course that year.