If one has no priority and don’t buy NR, for Shatin Junior the chance should be almost zero. Even the ESF kindie students could not all get into their year 1 after graduation from kindie. And students at SJS don’t usually leave at junior years. Try ASHK or Malvern if you live in Shatin.
“6. How many INR places will be available?
In any academic year, the number of places offered to INR applicants will be limited to 150 across all ESF schools from Year 1 to 13.”