"At" or "from" in "...finished preschool, grade school, and high school __ San Jose University"?

Our city mayor finished preschool, grade school, and high school at San Jose University"?

It sounds quite strange for a university to offer preschool and high school classes.

In our country, many universities offer preschool, grade school, and high school education.

More often than not, when we say "university," we only think about undergraduate education and postgraduate education. But in my country, several universities offer even preschool, grade school, and high school education.

Okay, I'll just reformulate the sentence.

Our city mayor finished basic education (in/from) that school.

Which preposition should I use?

Note: "Basic education" is the term used by the education department in my country to refer to the preschool, grade school, and high school education.

Rommel More often than not, when we say "university," we only think about undergraduate education and postgraduate education. But in my country, several universities offer even preschool, grade school, and high school education.

That is new for me. In the US, (and most European countries) education through grade 12 is given in public schools which are supporte

Our city mayor finished his basic education in that school.

AlpheccaStarsThat is new for me. In the US, (and most European countries) education through grade 12 is given in public schools which are supported by taxes. Some people go into the workforce directly after graduating from high school. Others go to college.

You know, Ma'am AlpheccaStars, I've been very happy since I joined EnglishForward.com because I've been l

Rommel Things which were once vague or unclear are now crystal-clear to me. You're indeed heaven-sent.

Thank you, Rommel. Keep on posting your questions. We learn about other cultures too, so it is good for everyone.