How to grade quizzes?
Essay and short Answer types require manual grading by quiz author. To do so All you have to do is go to the main quiz page by either searching for it or looking through “My Quizzes” and selecting the appropriate link. This page is the page with a URL format:
http://www.proprofs.com/quiz-school/story.php?title=XX
Where XX is the title of your quiz such as:
http://www.proprofs.com/quiz-school/story.php?title=Name-that-Game
This page has buttons for “Quiz Stats” & “Score Reports” on the right hand side.

"Quiz Stats” & “Score Reports”
Once you have found it, login as quiz author & click the button titled “Score reports” to review score reports.

Score Report
Each score report has information on the quiz, such as the score, total correct, and result, as you can see below.

score report card at the end of quiz report
Finally, you can adjust the score by assigning bonus points. If there were multiple Essay style questions, total the points you want to assign and then add the total as bonus points. Currently individual grading of questions is not supported.

Grade or assign bonus points at the end of quiz report