Grade 4

By this stage some children are coming to the end of their formal spelling program and are just needing reinforcement and practice.

Joelle Grubb
Grade 5

This age is when many children turn a corner and start being more independent with their learning. 

Joelle Grubb
Grade 6

By this stage, if your child has already done a good amount of science using Science in the Beginning or Apologia's Young Explorer series, and if science is their strength, they may want to try Apologia's highschool General Science.

Joelle Grubb
Years 9 & 10

By the time your child is around 14-15, they should be able to work independantly, 

Joelle Grubb