Which course?

 
Elementary courses
 
 Discovering God's World (typically 6 - 8 yrs)
 nJoy General Science (typically 9 - 11 yrs)
 
Middle and high school
 
 Apologia General Science (typically 12 - 13 yrs)
 Apologia Physical Science (typically 13 - 15 yrs)
 Apologia Biology (typically 14 - 18 yrs)
 Apologia Chemistry (typically 15 - 18 yrs)
 Earth & Environmental Science (typically 15 - 18 yrs)
 Apologia Physics (typically 16 - 18 yrs)