For each item that you have in your document, click on the accessibility guideline(s) that corresponds to it in order to learn how to make the element accessible.
Google Docs Accessibility Checker
Grackle Docs is an accessibility checker for Google Docs. It’s an Add-On for the Chrome browser. Download the Add-on and then in any Google Doc, go to the Add-Ons menu and select Grackle Docs and then select Launch.
Ensure your text is readable by using at least 10px san serif fonts,
such as Arial, Helvetica or Verdana. These font types will magnify well
for those who have low vision.
If there is an image with text in it, make sure to put the text in
the alternative text so it will be accessible to blind students.