So I found a great study guide for the different levels of licenses.

Technician-Class License Study Guide

TECH STUDY GUIDE PDF FILE

AMAZON KINDLE VERSION

BARNES AND NOBLE VERSION


Technician-Class License Study Guide (for tests after July 1, 2014)
Free PDF File

AMAZON KINDLE VERSION

BARNES & NOBLE VERSION

General-Class License Study Guide

free version (PDF file)

Amazon Kindle version

Barnes&Noble Nook version

Extra Class License Study Guide

PDF file

Amazon Kindle version

Barnes&Noble Nook (ePub) version