The Law School Admission Council (LSAC) grades your performance at a scale of 120 to 180. Your LSAT score is used by law schools as a standard of skills that you have acquired in the past and verbal reasoning skills. The LSAT score is used for making applications to law schools.
Possessing LSAT score does not guarantee admission into law schools. You have to fulfill the eligibility criteria laid by individual law school, if any. For admission into ABA Approved Law Schools you require registering with Law School Data Assembly Services (LSDAS).