All titles with come with answer keys

This is a great self-study book program that provides in-depth instruction on Theory, Code, and Calculations.

This library includes:

Electrical Exam Preparation Textbook
Understanding the NEC, Volume 1 Textbook (Articles 90-480)
Understanding the NEC, Volume 2 Textbook (Articles 500-810)
Electrical Theory Textbook
Master Electrician Practice Exam