Florence,
I'm so glad that your son is getting a chance to use HOD's science in CTC and enjoying it.

We pray that it may continue to be a blessing to your family. While we do respect the fact that it is completely up to each family to decide which direction to go curriculum-wise in the area of science, and we realize there are many good science options

, we also strive to keep the discussion on the HOD Board about science to those that we schedule and carry.

This is because these are the sciences which we are best able to comment on and to help our customers utilize well. I believe that Apologia has their own message board that you could visit to get more feedback and information on their middle school/high school level programs which would help with your questions.
Blessings,
Carrie