It depends on the teacher(s), the class size, and the individual students' intellectual development. For instance, dd4 attends a mixed preschool / pre-k class. She has two teachers and just nine students in the class, so the teachers can truly differentiate with regard to pace and depth of subject matter for each child. Some of the pre-k students are just beginning to read, whereas one of the preschoolers taught herself to read independently at two and is now reading chapter books at a second-grade level with good comprehension. Similarly, some of the children are at a "K" math level while others are simplifying fractions. For advanced learners at least, sometimes the labels--"pre-K", "K" etc--just don't adequately describe a child's intellectual development, and therefore to insist on rigid age grouping is not always educationally sound.
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