Commenting on Socrative

Thank you for the information about Socrative.  I will check it out.  I am in the process of creating a pre-post test that students can take digitally so it is automatically recorded and graded.  What a concept!  I am tired of grading paper tests!!!  I am currently using Google Forms, but I am stuck.  I need to figure out how to add photos into the form so students can answer questions based on the image.  Is anyone aware how this might get accomplished in Google Forms?