Is it necessary to send my child to pre-school at 2-3yo? If not is there any disadvantages? Like hard to catch up the syllabus compare to others. Thinking to send her directly to K1.

I was told by the teachers that there is a difference between kids who went to Sch at very young age and at older age. Kids whom went in is much more independent. At later stage, falls sick less frequently (immune to most germs in Sch).