The thing to keep in mind is that the grade structure of any order is to some extent arbitrary -- it's one way of trying to see to it that each student in that order gets a good general education in occult philosophy and practice. If a student takes up the basic practices and performs them relentlessly, especially if their practices include discursive meditation and they also put some time into reading and study of occult books, they're going to end up learning a great deal about occultism and achieving spiritual development, whether or not they do it according to some specific system of grades.
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The thing to keep in mind is that the grade structure of any order is to some extent arbitrary -- it's one way of trying to see to it that each student in that order gets a good general education in occult philosophy and practice. If a student takes up the basic practices and performs them relentlessly, especially if their practices include discursive meditation and they also put some time into reading and study of occult books, they're going to end up learning a great deal about occultism and achieving spiritual development, whether or not they do it according to some specific system of grades.