Many schools use AR or Lexile to help measure reading ability. Make sure you give your child plenty of time to choose books that they want to read outside of AR or Lexile requirements.
Don't be alarmed if your child brings home a book that you feel is too "easy." Some researchers think children read in wavelike patterns—at times reading easy books, then harder books, and then back to easy ones again. Reading books that are easy for them is not only enjoyable, but it helps them gain speed in reading. A child reading an easy book that he or she enjoys is learning a love of reading, and we need not be concerned that they will stop their reading development at that stage. One day they will become bored with their easy reading and will move on to another author or another type of book.
As our children become good readers, we are often tempted to push them or urge them to read books that are within their reading abilities but that are above their understanding. It is not enough that children can read the words, they must also have had enough of life's experiences to understand what the author is trying to say.
Finding books about topics your child is interested in will help him or her enjoy the reading experience. Ask a Librarian or search the library's catalog to find books that might appeal to your child.