Mike Holt’s 2023 Master Exam Preparation Book PackageThis is a great self-study book program that provides in-depth instruction on Theory, Code, and Calculations.This library includes:Electrical Exam Preparation TextbookUnderstanding the NEC, Volume 1 Textbook (Articles 90-480)Understanding the NEC, Volume 2 Textbook (Articles 500-810)Electrical Theory TextbookMaster Electrician Practice Exam Answer Key(s) included with all Mike Holt products.