Create a Google Form and submit it once with the correct answers (to be used as a key).
In Google spreadsheet associated with Google form, click on Tools tab and select Script Gallery.
Search for Flubaroo script and install. You will also have to authorize the script to run.
After all students have completed the form/assessment, click on the Flubaroo script tab and select "grade assignment".
Assign points to each of the questions on the form.
Select which entry will be your answer key.
Review the grades in the new tab at the bottom of the spreadsheet entitled "grades".
Visit www.flubaroo.com for support.