You can test yourself online for many different attributes such as intelligence and personality. I am enthusiastic about the Myers-Briggs personality inventory, which you can read about in eNotes by clicking on the reference links below. The purpose of the type indicator is to help determine one's character and aptitudes and to suggest the kinds of occupations a person would be best suited for based on his or her type. There are various Myers-Briggs type tests offered free on the Internet. Most ask a number of simple true-false or multiple-choice questions. It seems to me that developing your leadership skills would include learning who you are and where you belong, also how you rank on the introversion-extroversion scale, which is something else you can test for nothing on the Internet by searching "Self-testing" and related topics. It would also include being well educated and having a good command of the language.