If you can't make any P1 registration to your kid before Sept 2012, it's 100% 犯法 and you'll receive reminder letter by the end of August (my friend last year received such letter), be careful of it ..
maybe all hk kids go to the so called 'not good school " and all mainland go to the "good schools",, end up.. the "not so good school" becomes better.? you never know..