Officially GT announced that there are two classes in MK and two classes in TKO. However, not sure whether it means that 50% of total students will be enrolled in the first round.
GT would separate the interview for parents and children. For parents, they just asked why you would like to choose GT and the characters of your child. For children, my boy told me that they had asked him some questions in English and played around in the group.
I did send the profile to them but not sure whether it's really useful or not.
GT has a second round of interview and would have a briefing session. You can ask questions there.