While your textbook is designed to facilitate learning about Biology, not all of us learn in the same way and sometimes we need a resource that presents material in a way that meets our particular learning needs.
Below are resources that take different approaches to presenting the material covered in your textbook that may meet your particular learning needs.
Biology for Dummies, 3rd ed. by 
Biology Workbook for Dummies by 
The Complete Idiot's Guide to Biology by 