Twelve Connecticut teachers involved in a test-tampering scandal are being allowed back in the classroom after losing 20 days’ pay and agreeing to serve 25 hours of community service by tutoring students after school. State education officials determined that the cheating effort was led by Hopeville Elementary School’s principal and reading teacher. The principal is fighting dismissal, and the reading teacher resigned. Some 160 students whose test scores showed phony gains had to retake their exams.