Assess if the pages are easy to read and follow.
To get a better sense of the value, you may want to look for broader discussions on forums that focus on the specific educational organization (e.g., Catholic Heritage Curricula) that produces the "GDFE" (Growing in Faith, Growing in Education) materials. Download GDFE Sample Pages pdf
Evaluate if the reading level and tone are appropriate for the intended student. Assess if the pages are easy to read and follow