Also keep in mind that school rankings are determined by no. of Band 6s / total exams sat (as a ratio) ... so schools which are ranked highly may not necessarily be the best for you (as they may have a smaller cohort which makes it technically easier for a larger proportion of students to get Band 6s). For example, a cohort of 40 students will most likely have a higher proportion of Band 6s than a cohort of 220. You may thus fare better at a school which may be lower ranked, so don't just look at the rankings when deciding.