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 think at 2 to 3yrs old. An early exposure to school will be good. u can enroll the playgroup 2 to 3hours at least to let the LO get more socialise and learn to be more independent so that they be adapt more easily when coming at 4yrs old onwards it be the time to be more academic Base for them when they need to know the basic to catch up with their peers. you can consider Apple Tree , talent plus or star tots for 3yrs old which is good starting point to introduce the child about school