Accessibility options for G Suite for Education services and Google's Chrome browser have improved in the last couple of years. If you use these services with students who need improved accessibility options, the G Suite user guide to accessibility is a resource that you should bookmark. The user guide is divided into sixteen sections. In the first section you will find recommendations for the best screen readers to use while using G Suite on Mac, Windows, and Chrome OS computers. The other sections of the guide are devoted to specific products within the G Suite including Google Classroom. Each section contains information on accessibility shortcuts, screen reader instructions for each app, and in some sections you will find how to videos like this one for using a screen reader with Google Docs.
The Chrome Web Store includes a small collection of recommended extensions that can improve content accessibility.