最上級英語中學生

"最上級" in Japanese means "the highest level" or "the best" in English. If you're referring to English language proficiency for students, "最上級" would translate to "advanced" or "highly proficient."

"中學生" in Japanese means "junior high school student" in English.

So, "最上級英語中學生" would translate to "advanced English junior high school student" in English.