Cobb County Schools administrators recently presented to the board results from a district-wide survey on the performance of Superintendent Michael Hinojosa. The study showed students, teachers and parents gave Cobb schools a “B” or better in preparing students. The majority of participants also gave Hinojosa a “B” or better for making the right decisions to improve the district. The study, which cost the district $15,000, will be used in Hinojosa’s annual evaluation.