There's no standardized test or scoring system called "Lextile." Lexile is a common measure of reading ability, but a score of 1206 is extremely high for an eighth grader. Lexile scores generally range from below 200 to above 1600, with an average eighth-grader typically falling in the 800-1100 range.
A Lexile score of 1206 suggests a reading level far exceeding that of a typical eighth grader. This student is reading at a level significantly above grade, possibly approaching or surpassing that of a high school senior or even a college student.