It’s not every year a high school graduates 17 members off its wrestling squad, but that’s what happened at Bear River in 2012. As a result, the Pioneer Valley League champs are faced with a landslide of new challenges this season, and getting back to the basics will be a popular theme. Seniors J’Sean Harwood, Brent Wenger, Travis McKnight and Devin Schumacher are going to need to be an influential wave of enthusiasm and experience for the rest of the team to tap into. “We do lots of drills with different situations to prepare for the matches,” said coach Kevin …