Totally agree with Woody_lui's saying "最緊要是小孩自己的學習動機".....
In fact, as far as I know ~ some recent old 九官 students who were only ranked at 2x in grade in primary, but they could still be the top 1-5 in grade in some band one EMI (in KL3 net) secondary schools.
Another example, one of my friend who send her 2 girls to one famous & "hot" primary school in the HK island East (new compus in net #16, many years ago, this school used to emphasis over 8x-9x% students can enter band 1 EMI schools under old secondary school allocation system.......) Unfortunately, her girls have no motive at all on their studying and her girls can not to be promoted to the 2 "elite classes" in school........ The syllabus in that school is similar to 九官 as well, my friend is very worrying her girl's future now.
No matter what kind of school your kid enters, the key point is how to train him to be responsilible/aggressive/self-discipline to his own studying business .