Sun Coast high school principals who’ve been awaiting report cards on their schools are going to have to wait a little longer. The Florida Department of Education says its annual letter-grade system, which assigns an actual grade to each school based on its performance during the year, is being delayed because some schools are being given extra time to submit data. The grades are important because if a school receives an “A” or improves its performance by a letter grade, it receives what are called “recognition funds” — amounting to seventy dollars per student.