Today's presidential nomination process is based on subjective logic. The people are unable to determine with absolute certainty whether a candidate is 'better' or 'worse' than their competition or even the past presidents. Creating a standardized examination for candidates, designed to measure the skills one needs to succeed as president, enables an objective view.
This objective view consequently forces candidates to align themselves from a younger age to become students of the profession - achieving the education and experience necessary to become admitted as president. Inherently creating a process similar to that of becoming an attorney, where one must have a particular educational background and pass a series of exams in order be qualified to practice law.