While your textbook is designed to facilitate learning about Biochemistry, 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.
Pain-Free Biochemistry by 
Clinical Biochemistry Made Ridiculously Simple by 
Biochemistry for Dummies®, 2nd ed. by 
Basic Concepts in Biochemistry by 