n now purchase complete printed copies of their course's supplemental textbook, Principles of Real Estate Practice in North Carolina by Mettling and Cusic. Principles of Real Estate Practice has already helped 100,000s of students successfully complete their required courses and state license exam over the past twenty years. Now, to further enhance your learning experience, and to better prepare you to pass both the required course and the North Carolina state PSI exam, Real Estate Institute is pleased to offer all students the immediate availability of the printed text.