You may contact them to inquire about the application period. I remember it was in around Oct or Nov when I got the application form. But you may call them in around Sep.
Yes, it has voucher for K1 to K3 but it is not a 一條龍 school.
My daughter is also a small B and there are a lot of small B in her class. Each month they even have new students who are all small B who start school at the age of 2.