In general, to study a 3-year LL B , you are usually required to have a bachelor's degree in any field. This may encompass arts, science, commerce, or other categories. The aim is to ascertain that you already possess some amount of academic maturity before embarking on the focused study of law.
But if you are considering a 5-year integrated LL B program, you can enroll immediately after your high school or equivalent studies, without the requirement of an earlier degree. This program integrates undergraduate studies with legal education, such that students can graduate with both a law degree and a bachelor's degree. There are particular entry requirements of some law schools, e.g., minimum entry grades or even entrance examinations, so it's worth enquiring with the organisation you are going to apply with.