Looking on the internet deeply has found these results:

On high school is the most popular phrase on the web.

At high school 121,900,000 results on the web	On high school 160,400,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Did they teach you that at high school? I'd never met her at high school. I've been getting engaged all these chicks who broke up with me at high school, because of my acne, and then I dump them right before the wedding. At high school you always said you wanted to be a copper. He's at high school and has a moped! I was born and raised in Texas, played football at high school. He was at high school with you and Simon? Girls must've adored you at high school.	I don't want to look back on high school and feel like I missed out on something. And fashion's got nothing on high school. depth report on high school violence. listed for the Pulitzer last year for my Newsweek piece on high school athletes going pro. Katie Couric would do an in I was short Ten years ago here was a serial killing on high school girls. And now I look back on High School and think, well, that explains the Steve McQueen posters.

At high school

121,900,000 results on the web

On high school

160,400,000 results on the web

More popular!

Did they teach you that at high school?
I'd never met her at high school.
I've been getting engaged all these chicks who broke up with me at high school, because of my acne, and then I dump them right before the wedding.
At high school you always said you wanted to be a copper.
He's at high school and has a moped!
I was born and raised in Texas, played football at high school.
He was at high school with you and Simon?
Girls must've adored you at high school.

I don't want to look back on high school and feel like I missed out on something.
And fashion's got nothing on high school.
depth report on high school violence.
listed for the Pulitzer last year for my Newsweek piece on high school athletes going pro.
Katie Couric would do an in
I was short
Ten years ago here was a serial killing on high school girls.
And now I look back on High School and think, well, that explains the Steve McQueen posters.