The official JLPT website offers downloadable PDF booklets and audio files for "New Japanese-Language Proficiency Test Sample Questions" and "Official Practice Workbooks" (Volumes 1 and 2). These workbooks contain questions selected from actual past exams administered since the test format changed.
Volume helps, but only if you correct your mistakes. Doing 10 exams without reviewing is just wasting paper. jlpt past exams
Since official past papers are restricted, many students use third-party "mock" exams or archived materials: The official JLPT website offers downloadable PDF booklets
Studying past materials bridges the gap between passive language recognition and active exam execution. jlpt past exams