Erm, the interviewer is really nice. So, don't need to be too nervous. She seems very accepting towards everyone (even if you do not have experience in that field). But probably for self intro, you can say things like why you will want to study early childhood and not continue studying what you have learn earlier? Like maybe you enjoy the interactions with kids? something that inspire you? I would say avoid saying things like "cause the government start to focus on this sector and there is more job vacancy...". They want to hear about HOW PASSIONATE YOU ARE (I feel).
Try researching on this course on the school website! See what modules they offer and stuff

In case the interviewer ask questions like "what you know about this course?", you won't get caught off-guard
I went for the interview, and I didn't have related diploma, only experience. There are people in my group who do not have related diploma and experience too. I think if you do not have any experience in that field ... then do you have niece or nephew that you are close to? maybe can link to that area? Doesn't have to be teaching experience, simple interactions with kids below 9 will do.
And for the group interview, just try to answer as many questions as you can. There will be a hands-on activity for you to do first (as a group) before the discussion. For the activity, try not to like stand there and watch people do things? and don't be like too bossy (wants to do everything on your own) either. Then for the discussion part, I think you may want to consider answering as many questions as possible (to make an impression for the interviewer, since you may not have any experience on that area). There's no right and wrong answer for those questions too they just want to listen your views and thoughts.
For intake wise, I not too sure too!
Hope you find this useful!