Easily annotate and edit any PDF with Kami that integrates with your Google Classroom. When you setup your account, make sure you select that you are an educator and you will get full access to the system.
A quick overview of how to use Kami in your Google Classroom.
This YouTube playlist will walk you through all of the various ways to use the platform from PreK-12 for Math, Science, SPED, Social Studies, and more.
All students have access to Read&Write for Google Chrome now. In addition to some of the great highlighting, annotating, dictionary, and read-aloud (text-to-speech) features in R&W, it also has a great PDF mark up tool.