Last week Google introduced some long-awaited style customization options. This morning Google introduced another long-awaited feature. That new feature is "locked" mode. Locked mode will be a setting that you can activate in Google Forms when you create and distribute a quiz. The locked mode will prevent students from leaving the Google Form until they submit their final answers. Locked mode will be available in the fall.
Before you get too excited about the locked mode for Google Forms, it is important to note that it will only work on Chromebooks that are managed by your school. So if you don't use school-managed Chromebooks you're going to need to find another solution to prevent students from opening new tabs or windows while completing an online assessment. One possible solution is the new Lockdown Browser option from Otus.