The 4% cap is there for a reason. Say for example, Glen Waverley and Box Hill school, every year I heard they have hundreds of students sitting for the selective schools. Most of these students are quite smart. If there are no cap at these school, I am sure they will take out most of the places in selective school. But the problem with these school, I am sure there are many students will get 5 superiors in the exams. Say around 30-40 students got 5 superiors out of 150 students, only 20+ will get the offer for a place in the selective school. Its a harsh reality, I think the best way its to go for a big school and less competitive one.