Flunking the Test

I gave a chapter test in Science to my class on Thursday. About half of them flunked the test. How discouraging is that? Extremely, because I had given them the exact test to study on Monday. We went through each question and discussed the possible answers, then I gave them the correct answers. We studied during school time for three days before taking the test. I don't think some of them looked at the test on their own time. How sad.