Malaysia has
bumiputera, the concept of the indigenous people of the country, which is basically the ethnic Malays and various native peoples because Malaysia is basically the aggregation of all British colonies in SEA minus Singapore because shit happened. That aside, they actually define what a Malay is in the constitution, and legally you have to be Muslim to be a Malay, so if you only consider Malays to be "pure Malaysian" I highly doubt there would be a Malay attending Catholic school. Bumiputera, probably (those can be Christian and in Borneo they often are), Malay, I doubt it.