Looking on the internet deeply has found these results:

back in university is the most popular phrase on the web.

back at university 1322,000 results on the web	back in university 1325,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It is very important you safeguard the spell in your head and bring it back to us at the University in time for the Solstice, so when... the moment is precisely right, we can be said. I don't know, Guess who came back from university today? You could go back to university to improve your knowledge. Known each other since our days back at Beida University. I might go back to university, do another degree. Meanwhile, back at TED University, this wonderful woman is teaching you how to chop Sun Chips. So Robert Wright Meanwhile, back at TED University, this wonderful woman is teaching you how to chop Sun Chips.	I might go back to university, do another degree. powered clocks. You could go back to university to improve your knowledge. Here's why. Back in university, we had a quick project to design some solar I remember lecturing at Cambridge University back in the 1990s, explaining why it was deeply flawed and could not work and I gave it about 10 years and I am afraid it looks as though I was right Guess who came back from university today? was flawed even by your own rule book. Eric Bieniemy played running back for the university of Colorado from 1988 to 1990.

back at university

1322,000 results on the web

back in university

1325,000 results on the web

More popular!

It is very important you safeguard the spell in your head and bring it back to us at the University in time for the Solstice, so when... the moment is precisely right, we can be said.
I don't know,
Guess who came back from university today?
You could go back to university to improve your knowledge.
Known each other since our days back at Beida University.
I might go back to university, do another degree.
Meanwhile, back at TED University, this wonderful woman is teaching you how to chop Sun Chips. So Robert Wright
Meanwhile, back at TED University, this wonderful woman is teaching you how to chop Sun Chips.

I might go back to university, do another degree.
powered clocks.
You could go back to university to improve your knowledge.
Here's why. Back in university, we had a quick project to design some solar
I remember lecturing at Cambridge University back in the 1990s, explaining why it was deeply flawed and could not work and I gave it about 10 years and I am afraid it looks as though I was right
Guess who came back from university today?
was flawed even by your own rule book.
Eric Bieniemy played running back for the university of Colorado from 1988 to 1990.