Google launched locked mode as a way to secure Quizzes created in Google Forms.
With locked mode turned on, a teacher can “lock” a Form so that students on managed Chromebooks cannot navigate away from the quiz until they submit their work.
Locked mode can enable locked by simply toggling it on in the Quizzes tab under Settings.
With Read&Write (PREMIUM): users will have access to the most common accessibility and productivity tools such as Text to Speech, Word Prediction and Talk&Type dictation. Some features, such as the ability to collect highlights, build vocabulary lists, and web search, will be disabled due to the nature of locked mode.
With EquatIO (FREE): Common tools like the equation editor, graph editor, handwriting recognition, and speech input will all be available to help students create and input digital math. Similar to Read&Write, some features like the EquatIO mathspace integration and Screenshot Reader will not be available while in locked mode.