Ranking, hmmmm!
Who has time to compare the rankings of schools when they all are there to guide you to the certification exam? Good or bad, it is a school that is the train to your future. I would hop on whatever train will take you there, no matter the ranking.
Besides, most of school is about the effort you put in, the non-stop reading and memorizing and applying and dedication and discipline.
Read "7 Habits of Highly Effective People" and then apply. You will need to be organized and disciplined to make it through!
Back to the books...