The Law School Admission Test (LSAT) is a norm-referenced, or standardized test that is administered by the Law School Admission Council (LSAC). It is intended to provide law schools with "a standard measure of acquired reading and verbal reasoning skills that law schools can use as one of several factors in assessing applicants"*. Formally, LSAC correlates LSAT performance with first year law school grades. The LSAT is administered four times per year, traditionally in February, June, October, and December, and scores are distributed on a scale of 120 to 180—with 180 the highest possible score, and 120 the lowest. The number of students taking the LSAT increased by over 30% between 2000 and 2002, but slowed in 2004. Although the number of test-takers dropped by about 5% in 2005, the total of more than 137,000 examinees that year is significantly higher than the 104,000 people who took it in 1997.
Logical reasoning sections usually consist of 24-26 questions each. In its official LSAT Superprep, LSAC scores questions on a difficulty scale from 1-5. Most logical reasoning sections contain 2-3 level 5 questions. The arguments section is somewhat difficulty-graded. While not directly graded like the SAT, the hardest questions tend to come toward the end of the section, while the first 10 often contain no questions above difficulty level 3.
Throughout the 1990s, these sections have become shorter, now often ranging from 21-22 questions instead of 22-24 as in the middle 1990s. This section is billed as the most coachable by most LSAT test prep materials and companies. In response, LSAC has increased the difficulty of the questions to such a degree that examinees are discouraged by most test prep materials from using exams from the early 1990s to practice this section.
The fairness of this section is often debated. The student does not know exactly which section is ungraded. Examinees can determine which type of section it was before the exam is over, but only after the examinee has already completed at least one such section. For example, if the student has already done two arguments sections and runs into a third one, then one of those three was the experimental section. Some examinations will include three arguments sections, others will have two games or reading sections. The order is also unpredictable, which allows for the possibility of, for example, three arguments sections in a row. Depending on ordering and where a given examinee's weaknesses lie, an examinee can severely underperform (or overperform) on one specific testing. No formal examination of the impact of the experimental section has ever been done, and examinee scores tend to steadily rise with practice regardless. The experimental section also amounts to unpaid research being done on LSAC's behalf by examinees who are already paying for the testing.
Because of the importance of the LSAT in law school admissions, it is strongly recommended that all applicants prepare thoroughly before taking the exam. The structure of the LSAT and the types of questions (and quantity of each) that will be asked are generally known ahead of time, which allows students to practice on question types that show up frequently in examinations and avoid wasting time on question types that may appear only once or twice. Because of this, the exam responds, in most cases, to preparation, and the Law School Admission Council recommends that students prepare beforehand.
Considering that the LSAT is usually taken only once, most students experience at least some improvement, and that admission to law programs in America has become increasingly competitive, any student wishing to qualify for a desired program should therefore probably take the time to prepare well for the exam. Doing so will likely significantly improve their odds of success. When preparing, students should keep in mind that only tests after 1995 are considered "modern tests." The LSAT has undergone many significant changes since the early 1990s.
LSAT score distributions taper off significantly at the extremes (high and low scores) and tend to congregate near the median score. That is, an examinee who scores a 175 may have missed only 4 questions more than an examinee with a 180. However, the number of uncredited responses that separates a 155 from a 160 could be 9 or more. Although the exact percentile of a given score will vary slightly between examinations, there tends to be little variance. The 50th percentile is typically a score of about 150; the 90th percentile is around 163 and the 99th is about 172. A 179 or better usually places the examinee in the 99.9th percentile.*
All examinees may cancel their LSAT score within nine calendar days of the exam. LSAC still reports to law schools that the student registered for and took the exam, but releases no score. Although there is no appeals process for examinee complaints (e.g., proctor called time early, a cell phone went off, a question has ambiguous wording, etc), a specific question may, on rare occasion, be omitted from final scoring.
Unlike other standardized examinations in America, the LSAT is the most important criterion in its corresponding school admissions process. The second most important criterion is undergraduate GPA. Most prestigious law schools receive far more applicants than they can accommodate; the examination offers admissions officers a simple and generally effective way to eliminate a large number of applicants from the pool. Also unlike other standardized tests, all of an examinees scores are reported to each law school to which the examinee applies, not just the highest or most recent score. Although most law schools consider all of an applicant's LSAT scores in their admission decisions, a few only consider the highest or most recent score, and the trend in recent years has begun to shift toward the latter method.
The statistical correlation between LSAT score and first year law school grades is not particularly strong; however, no better individual measure is currently known to exist. Although the correlation varies from school to school, LSAT scores are far more strongly correlated to first year law school performance than undergraduate GPA.* Admission boards almost universally employ an admission index that weighs both the LSAT and undergraduate GPA on an combined scale. The admission index is essentially a mathematical formula that applies a weight to each factor and adds them together to form a composite statistic. This composite statistic has a stronger correlation to first year performance than either GPA or LSAT score alone. The amount of weight assigned to LSAT score versus undergraduate GPA varies from school to school, as almost all law programs employ a different admission index formula.
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