I have this problem too. My daugther was also borned in December. I am considering to let her try once in K3, if she can not enter satisfactory school, I may let her to repeat K3 for one year. Any parent has this kind of experience to share?
No, it is because each kids just can apply one time to choose their primary school. If you applied but repeated in K3, you will not have another chance in the coming year. That means you give up the 9 years free education from government.
All depends on the child's ability.
If he is not up-to-standard, it is better for him to repeat in either K.2 or K.3.
Everyone has one chance for school allocation through luck draw which only depends on luck but not his standard/talent.
But private school or direct subsided school needs up-to-standard students.