KKH patient here. I was advised to do my pre-admission from 36 weeks on when I asked at 34th week.
When you are doing the paperwork for pre-admission, do remember to clear your outstanding payment first and they will require you to pay for the deposit as well. Wards are subject to availability and they will go by the next level below your choice if your preferred class is not available during your admission. (best to seek clarification if unsure)
I was advised that I only need to bring my IC for the documents on the day as they will have my pre-admission documents in their records. But I'll still bring mine along, just in case.
Anonymous