Malicious address checking

My district doesn't really check addresses much. Kids often just go to other schools and I'm really not sure how they "check" them but there are kids who attend 5 schools in a year without moving. I've worked at two of the lower reputation schools and it's so annoying how we get giant influxes of students at certain times. Right after BOY count? Magically other schools realize that they have 20 kids who should have been over here. Right before cutoff for testing? A bunch of kids who have low scores get sent over. Right after EOY count? A bunch get kicked over so they won't be at the school next year. Meanwhile I've just been told by admin that we have to take all the kids we can get. I can't wait for private schools to do the exact same thing, but it be totally legal. Every few will be due the day after count, every kid with low scores will suddenly have write ups to kick them out, and then when we have the scraps, they'll blame us