This report examines the frequency of particular teacher preparation experiences and explores their relationships to beginning teachers' effectiveness in improving student test scores once they get to the classroom. The report found both differences in how teachers prepare for their certification in the field and that certain experiences are related to improving test scores in the classroom. The findings provide a detailed look into current teacher preparation practices and identify potential avenues for improving them. [For the appendices, see ED598665. For the executive summary, see ED598666. For the study highlights, see ED598667.]