There are quiet students in my girl's class too. I think the quiet students have been influenced by the other active students and have become more outspoken and cheerful. It's true that they won't be the star students in class but I think they feel happy when they see active students around them. ( we are in LV campus.)
Mr girl attended the interview for PN class2 years ago. The teacher asked her to put coins into a piggy bank, match different fruits to the corresponding pictures, match cars with the same color. The teacher also talked to the kids.