District has non-English but kids are French and Arabic. Math test can be read to kids with reading problems. So math scores may be higher than reading because can't read the reading test to them. 3 rd grade math is low because they can't read that well. No one says their district encourages them to stay home.
Some parents object to test and keep their kids home on their own because of objections to test.
Will have to take eventually in high school. Only 2 per grade can be ARDed out. Some districts exempt very few kids. If kids are not there, administrators track them down. Attendance is highly encouraged.