
Anil K. answered 04/08/19
Experienced Test Prep Tutor
You are right about this. The scanner check the test and only scans the bubble. The writing your answer above those bubbles is for your personal reference. Some test taker (including me) find is easy and nor confusing to bubble once there is number above the bubbles.
I have had students who only circled the bubbles are scored a perfect test score. So, if you think writing wastes time, you are free not to write your answers.