The LSAT consists of five 35-minute sections of multiple choice questions. Four of the five sections contribute to your score. These include one reading comprehension, one analytical reasoning, and two logical reasoning sections.
The unscored section, usually referred to as the variable section, is used to pretest new questions or evaluate new test forms. The placement of this section varies, and you won't know which section is unscored until you receive your score report.
The LSAT also includes a 35-minute, unscored writing sample. The writing prompt presents a decision problem, and you are asked to choose between two positions or courses of action, and defend your choice. There is no “right” or “wrong” position; the writing sample lets you demonstrate your argumentative writing skills. Law schools are looking at the reasoning, clarity, organization, language usage, and writing mechanics you display in your sample. Copies of your writing sample are sent to all schools to which you apply.