ADHD WORKBOOKS FOR KIDS/TEENS
For kids:

The ADHD Workbook for Kids: Helping Children Gain Self-Confidence, Social Skills and Self-Control
By Lawrence E. Shapiro

Putting on the Brakes: Activity Book for Kids with ADD or ADHD, Second Edition
By Patricia O. Quinn and Judith M. Stern

Thriving with ADHD Workbook for Kids: 60 Fun Activities to Help Children Self-Regulate, Focus, and Succeed
By Kelli Miller
For Teens:

The ADHD Workbook for Teens: Activities to Help You Gain Motivation and Confidence
By Lara Honos-Webb

Winning with ADHD: A Playbook for Teens and Young Adults with Attention Deficit/Hyperactivity Disorder
By Grace Friedman and Sarah Cheyette