A friend had to transfer her kids there from another international school. The kids are Eurasian, with a Singapore mum. They passed the interview but the school was appalled with their level of Mandarin. The mum got a call from school advising her to get a tutor over the summer break so they could catch up.
Another Singaporean friend, her son sat the entrance exam when he was 4 or 5. It was a written Maths, English, Mandarin exam. He just sat there for 3 hours. He couldn't read so wasn't much he could do. He was still accepted but they decided the school wasn't a good fit.