A two hour exercise is planned for Newtown school students and their parents next week.  Newtown school officials and the Newtown Police Department are planning a parent-student reunification exercise.  The plan will simulate an emergency, and then have parents and students go through a drill where adults are able to pick up their children.  The exercise is planned at the Newtown Youth Academy next Wednesday.  Newtown High School administrators are looking for students willing to participate in the two-hour exercise.