High Class
High Grade
noun, な adjective, の adjective
When you are higher than equal, you are above the very top, you are above everyone. You are high class.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ずい分高等な技術を持っているんだね。
You have an extraordinarily high class technique like that, huh?
うちの息子はまだ小学生ですが、じゅくではすでに高等の数学を勉強しています。
My son is still an elementary school kid, but he is studying high grade mathematics at a cram school.
あなたの国の高等教育について教えて下さい。
Please tell me about higher education in your country.