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hong  
#1 Posted : Thursday, 27 October 2011 3:55:14 AM(UTC)
hong

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Let's look at profile score first. The total raw test marks will be max 165 but the mark added into the profile score will be max 200. Together with max 100 from the local school, the maximum profile score will be 300. In year 2010 OC, a few students got 300 out of 300 and some got more than 280 after up-scaling. The school mark component is important because most kids will have their school mark unaltered. Some classes will offer places with cut off of about 189-195 out of 300. In year 2009 OC, some schools in Sydney had cut off scores at 172 and 177. There were many schools accepted marks under 200. For example, Alexandria Park Community School is at 172. It is said that some schools give students between 85-99 (profile score) already, ie. some students only need 47% (of the max profile score of 200 from tests) to get placement in one of the lower ranked selective schools.
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sceptics  
#2 Posted : Sunday, 6 November 2011 6:09:14 AM(UTC)
sceptics

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hong wrote:
Let's look at profile score first. The total raw test marks will be max 165 but the mark added into the profile score will be max 200. Together with max 100 from the local school, the maximum profile score will be 300. In year 2010 OC, a few students got 300 out of 300 and some got more than 280 after up-scaling. The school mark component is important because most kids will have their school mark unaltered. Some classes will offer places with cut off of about 189-195 out of 300. In year 2009 OC, some schools in Sydney had cut off scores at 172 and 177. There were many schools accepted marks under 200. For example, Alexandria Park Community School is at 172. It is said that some schools give students between 85-99 (profile score) already, ie. some students only need 47% (of the max profile score of 200 from tests) to get placement in one of the lower ranked selective schools.
This is from some one who has not got access to information taken from the DET through freedom of information. The process to calculate marks is described on the Selective Unit website in general terms (but accurate as a guide). So go to the SSU webpage for more detail. School marks vary wildly so they have a moderation process where the average performance of all candidates from each school is used to match with the performance of all candidates across the state to decide the scale factor for the school. It could be up or down. But the general trend is that all schools will have down-scaling! But the good ones get less down scaling. The school marks actually contribute 50% but after down-scaling it is reduced a lot making the test marks more important. Then individual student down-scaling according to ranking inside a school kicks in. Top top student may get 25 marks off the school contribution per subject. The bottom ranked student at location 30th may 32 marks off. For example, the top one get 99 for maths, will actually get 74 (then only 1/2 of it will be used). But a student who is given 75 and placed at location 30th in the school for maths will get 32 taken off so it will be 43 (then only 1/2 will be taken into final profile). This reduces the numbers of students from a single school getting placed. It helps to spread the placements across more schools. The contribution of marks from schools is small but important to each individual. It is because students tend to crowd about the cut off point of each OC class. Their marks are within a few points or even less than 1 point. So by having a slightly better ranking or extra school marks, they get across the line. On the waiting list, there may be 10 students within 0.5 from one another! Fro example if the cutoff is 237, it is likely that most students are placed within 237.01 - 240.0 and many are between 237.01 - 237.99 Since 2008, they change the scaling so that students can now get 300/300. Before that highest marks were in range 261 - 280.
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