The most time consuming thing is grading. With Google Forms, multiple choice, dropdown, and checkbox questions can be automatically scored. Short answers and paragraph questions can also be collected but need to manually graded.

If you are using the form as a quiz or using and sort of short answer, you may want to release the scores later after you have reviewed them. Once you release the scores students will be able to see only the items you select such as Missed Questions, Correct Answers, and Point Values.