初中同学：Junior high school classmates
小学同学：Primary school classmates
拓展词汇
小学：primary school; elementary school; junior school; grade school.
初中：junior high school；junior middle school.
例句
过了这麽多年，他都已经忘掉了很多小学同学。 After so many years, he has forgotten most of his primary schoolmates.
为了证明我的猜想，我和一名初中同学找到生物老师。 To prove my guess, and I find a junior high school students biology teacher.
Junior high school students and primary school students初中同学和小学同学
primary shcool classmate小学同学
junir high shcool classmate初中同学