If you need a simplified, engaging biology text for struggling readers, the Bee Book is excellent— buy a used print copy . Avoid bootleg PDFs; they'll frustrate you with missing diagrams and wrong page numbers. If you are a capable student aiming for college, use the Macaw book instead.
The authors are evolution educators at heart. Evolution is not an afterthought—it's woven through every unit. The Bee Book retains this core strength.