Nakul succeeded where Suniti failed because Nakul had strong social skills in addition to average knowledge, while Suniti was solely a bookworm with no social skills. The document provides tips for balanced personality development, including maintaining equilibrium between study and play, discipline, and interacting with others rather than solely studying. It recommends taking online personality tests and reflecting on the results. The writer's personality test results are shared, noting their good habits of respecting others, helping those in need, and valuing knowledge, which makes them more rational and able to understand different situations. Honor is also part of their personality, keeping deception and the influence of others at bay.