Looking on the internet deeply has found these results:

I got an A in Science. is the most popular phrase on the web.

I got an A on Science 10 results on the web	I got an A in Science. 1145 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Oh, cells or somethin'. In Science, yeah? What you studyin'? Cells? Yeah, me too. Right here? Yeah. Everybody is good at something and I'm good at science. Really try hard. Oh boy! I got an A in science. Can you make a difference? Keep trying. Science Rocks! Expresses amazement to something unexpected, both good and bad. "Look out for that deer!" "DICK IN ASS" "DICK IN ASS... I GOT AN 'A' IN SCIENCE.". I got an "A" in Science. So, this is our building.

I got an A on Science

10 results on the web

I got an A in Science.

1145 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Oh, cells or somethin'.
In Science, yeah? What you studyin'?
Cells? Yeah, me too.
Right here? Yeah.
Everybody is good at something and I'm good at science. Really try hard. Oh boy! I got an A in science. Can you make a difference? Keep trying. Science Rocks!
Expresses amazement to something unexpected, both good and bad. "Look out for that deer!" "DICK IN ASS" "DICK IN ASS... I GOT AN 'A' IN SCIENCE.".
I got an "A" in Science.
So, this is our building.