It is similar to Selective streams and schools[1] Opportunity classes have a long history in NSW, with the first ones established in 1932.
[2] The impact of attending Opportunity classes varies with individual students, with some reporting negative experiences, while others report a strong sense of community and wellbeing.
[4] Not all Opportunity Class (OC) students apply to attend a selective high school, as in some areas attending a selective high school means either long daily commutes or living away from home.
The reality is that entry to both OC and Selective High School classes is via standardized testing that focuses on ability in mathematics, english and general ability (basically an IQ-style test), and that there are fewer places available for entry to OC (~1800) than to Selective High School (4214 places in 2015[5]), so in theory it is 'harder' to gain entry into OC than Selective High School and a large percentage of students attending OC classes gain entry to Selective High School, or gain a scholarship to a private high school.
[7] Prospective applicants undertake an aptitude test, consisting of mathematics and English literacy components,[8][9] the marks for which are sent with assessment scores based on the student's performance in Years 3 and 4 by the applicant's school principal.