In the United States, a person must complete four years of college, then three years of law school, then pass a state test called a "bar exam" in order to be an attorney.
It depends on the state or country they are in. In the US, most require a 4 year college degree, 3 years of law school and passing a writing bar examination.
A degree in jurisprudence, such as Juris Doctor or Bachelor of Legal Letters (L.L.B.) and pass a state bar in the state where you want to practice law.
A four-year college degree plus three years of law school are the basic educational requirements for lawyers. After formal training candiates must pass a stringent bar examination.