Relocating family to Northern Ireland with 3 young children

Hello! We are exploring options of moving from USA to Co. Down. I was born in Northern Ireland and I hold a British passport, our children also have British Passports. My husband is Swiss. I would like to find out how to get my children registered for primary schools in Northern Ireland. Will they need to be tested for placements? Does anyone have experience registering their children in schools?  I also want make sure that they do not fall behind as this might be a temporary relocation and I want them to be able to re-enter the American school system. Thank you!

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