The text is relatively easy to understand. We have only just finished Module 1, so this is a bit early in the process to be reviewing. But, so far, so good. I think it will prove to be thorough and more than sufficient to meet requirements for a high school biology course.
This product is exactly what a biology book should be! It contains tons of information that traditional biology text do not cover. My child loves the format and the study guides. We are both learning new information! A great buy!!!