So I'm not too sure on the education system in NZ but as someone that moved after primary school to Aus, I would say the public education system in Malaysia is really bad. Had to do a lot of personal catch up after moving.

How old are your kids? Ive known a few people that moved back from Aus with kids and their kids ended up being really miserable as it's a real shock how different the schooling methods are. Not to mention the increased racism your kids would probably have to deal with. People like to harp on about how asians are treated worse in Aus / NZ but its a really different case if you were born / raised there.

I am forever grateful to my parents for deciding to move to Aus and staying on for their kids education. They have moved back to Malaysia now and are enjoying their life with family.