By hearing ​yourself read a Google Doc out loud or go through ​your Slide presentation, ​you can often catch mistakes or find opportunities to refine ​your speech to make it shine.

Added Bonus: It integrates with Google Drive so ​you can even share recordings ​with teachers or members of group.

Link to Screencastify in the web store:

https://chrome.google.com/webstore/detail/screencastify-screen-vide/mmeijimgabbpbgpdklnllpncmdofkcpn