I never did like the teachers that gave out achievement tests, nor the ones who handed out the scores. Relax and give them time to develop emotionally. Allow them to be three years behind the normally accepted standard in academic achievement, and by the time they are sixteen they will be three years ahead. A child who is confident and secure will learn with ease. Fear of failure and rejection will close the mind up worse than retardation.
Children are all different.
The beauty of homeschooling is that we can adapt to the needs of the child. Our oldest daughter Rebekah loved books, writing, music, art, etc. She was reading by the time she was four, but she couldn't add the change in her pocket until she was baking bread. Our next son, Gabriel, could count money before he could speak plainly. It was nothing unusual for the average third grader, but with an older sister like he had, he thought he was pretty smart.