While new Nashoba Regional High principal Parry Graham is impressed with its background as one of the state’s high-performing schools, he is aiming for more than simply maintaining its performance, according to his recent newsletter to parents. “Nashoba is clearly a good school with a strong track record, but my ultimate goal as principal is not simply to maintain status quo: it is to raise the bar for the quality of education we provide all of our students,’’ Graham stated.