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Hey I'm preparing for jmss this year as well, and from all i've heard the math component is basic year 9 and 10 maths. Not as bad as selective.
1000 sit the exam and 500 get an interview so to get a interview you should get at least 1 superior, but it is possible to get an interview with no superiors but then you would need very high in all the categories. Hope this helps otherwise you can also drop your discord and ill add you to the server where we have some current jmss students and they can possibly help you with any questions you have.