Yes, many Japanese universities waive English proficiency tests like TOEFL or IELTS if your primary language of instruction throughout high school was English, though policies vary by institution. You’ll typically need to provide official documentation from your school confirming that English was the medium of instruction for all subjects, not just as a subject itself. It’s important to check each university’s specific policy and contact their admissions office early if you’re requesting a waiver, as some may still prefer test scores even with English-medium education, while others readily accept school certification as sufficient proof of English proficiency.