Eikoh Co., Ltd., a group company of Zoshinkai Holdings Inc. (Z-kai Group), will hold the “Oin and Joshi Gakuin Diagnostic Test” at its Eikoh Seminar Nakano School Specialized Center for Top-Tier Girls’ Junior High School Entrance Exams on Saturday, June 13 and Saturday, June 27, 2026. The event is aimed at third- to fifth-grade elementary school students seeking admission to Oin Junior High School or Joshi Gakuin Junior High School. On the day of the event, students will take Japanese and mathematics tests created through analysis of past entrance exam questions from Oin and Joshi Gakuin. The tests are designed to diagnose, from multiple angles, the abilities required for admission to the two schools. While students take the test, an information session for parents will be held at the same time. After the test, expert instructors who have helped many students gain admission to top-tier junior high schools will conduct an explanatory lesson on the test questions. Parents may attend the lesson seated next to their children, allowing them to experience the quality of instruction at the specialized center. Test results will be returned at a later date through an interview or by mail. The center will provide feedback on each child’s current learning status based on their answers, along with advice for future study. The score report will include an overall evaluation, score rates by question type, and subject-by-subject achievement diagnostics across five categories. The event will be held from 10:30 a.m. to 12:40 p.m. for third graders, with a 60-minute test and 60-minute explanatory lesson, and from 10:30 a.m. to 12:50 p.m. for fourth and fifth graders, with a 70-minute test and 60-minute explanatory lesson. The same content will be offered on both dates. The venue is Eikoh Seminar Nakano School Specialized Center for Top-Tier Girls’ Junior High School Entrance Exams, located one minute on foot from JR Nakano Station’s south exit. Participation is free, and applications