I have created an assessment for my Earth Science course. They will have a chapter test on Friday and I plan to give them this quiz on Thursday to motivate them to study Thursday night.
I found that editing the quiz after I had saved it was a bit tricky. I had to open the file given in the sent email to allow editing of the questions. You must make any later changes to you quiz by using the file that has the Google Docs menu active, most of the cases the menu was inactive (grey). Now go to the Form menu and select Edit Form. This will allow you to directly edit the questions just as when you were composing the quiz. VERY IMPORTANT, look at the link at the bottom of the Form/Quiz page in black and tells you that you can see form at this address. Highlight and COPY the entire address. I believe that this is your only chance to grab the link to the quiz, so DO IT NOW. Paste it into the blog editor immediately.
After changes are saved, all the versions of the quiz are updated, even the version displayed in this blog. I also had trouble finding a link to the quiz after I finished the quiz as discussed above. Apparently that info is gone after you close the Save screen. I later found the file address when I edited the quiz and created a link to my Rocks Assessment. I also embedded the quiz in this blog but this embedded structure greatly slowed the loading of my blog. Thus I opted to delete the embedded version.