ONETES is a Japanese education and information platform focused on middle school entrance exams in the greater Tokyo metropolitan area. It describes its public tests as the largest-scale offering in the region and provides a range of assessments for students in grades three through six. These include the Gokaku ONE tests, aptitude-based ONE tests, and Start ONE tests, as well as a Meiji University affiliated junior high school admission simulation test.

Families can register online, select and manage preferred schools, arrange test bookings and payments, access admission tickets, and view results. The platform also offers exam data and resources, including score and deviation-value information, answer explanations, past papers, school profiles, admission guidelines and results, and school event schedules. Its broader services include articles and updates on entrance exams, schools, education, and events, alongside school search information and consultation resources.

ONETES also provides digital learning materials and the ONETES CLUB ONE test app, supporting families as they prepare for school selection and the admissions process