Sorry! since there's not enough kids to form a group, I've sent the application individually today!
You may go to 香港基督教服務處's website to see the details.
I've called the center, the staff said the course are full already, all application rec'd after 23/1 would be rejected. Lucky that they've rec'd my application on 23/1. Next time, if any mum wanted to join, better apply as early as possible!