In year 10 entry there aren't any preferences or cohort percentage rules so you can actually get into more than one school(although even getting into one school is harder in year 10 entry than year 9 entry). I actually tried out for three schools this year, JMSS, SCHS, MHS. Sucks that I got rejected from MHS but SCHS gave me an offer and JMSS(not apart of the four main selective schools btw) gave me an interview, so there is hope if you try!