Some oldies but goodies!
Elementary - Sarah, Plain and Tall by Patricia MacLachlan
When their father invites a mail-order bride to come live with them in their prairie home, Caleb and Anna are captivated by their new mother and hope that she will stay.
FIC MAC @ the school library.
Middle School - Midwife's Apprentice by Karen Cushman
A homeless medieval waif who names herself Alyce is taken in by the village midwife, befriends a cat, learns about delivering babies, and confronts failure when an infant dies.
FIC CUS @ the school library.
High School - Fallen Angels by Walter Dean Myers
Seventeen-year-old Richie Perry, just out of his Harlem high school, enlists in the Army in the summer of 1967 and spends a devastating year on active duty in Vietnam.
FIC MYE @ the Library.