How do I grade all responces to a quiz essay at once?
In Moodle 2.3...
To grade all submissions to a quiz essay question at once. 
- Click on the quiz in the course you want to grade.
- In the navigation block, locate the quiz by going through the category, course, topic, quiz.
- Click on the arrow next to ‘Result’ to expand
- Click on ‘grade manually’
- Select grade all at once