Many of Maine’s school buildings were built more than 50 years ago, and they need a lot of work: asbestos and lead removal, new roofs, windows and doors. But in the face of budget cuts after the Great Recession, many schools have struggled to keep up with those maintenance needs, forcing some districts to make tough choices. There’s a giant, plastic tarp hanging below a hole in the ceiling inside the biology lab at Woodland Junior-Senior High School.