Mary has topped her class.

[tufguy]

1) Mary has topped her class.

2) Mary came first in her class.

Please check my sentences.

 

[Rover_KE]

They're both OK. I prefer #2.

 

[teechar]

Beware that one informal meaning of top is kill. Given the tragic school shooting stories we hear about every now and then, I can see why some would avoid the first sentence.
Take a look at entry #4 of "top" as a verb in the following link.

https://www.lexico.com/en/definition/top

 

[Yankee]

Beware that one informal meaning of top is kill. Given the tragic school shooting stories we hear about every now and then, I can see why some would avoid the first sentence.
Take a look at entry #4 of "top" as a verb in the following link.

https://www.lexico.com/en/definition/top

Sorry, but never heard/read "top" used in that sense (AmE).

 

[GoesStation]

Beware that one informal meaning of top is kill.

We don't have that meaning in American English. It also doesn't mean "come in first" in our version of English, so the sentence doesn't work but isn't potentially offensive for us.

 

[emsr2d2]

In BrE at least, you can use "She came top in her class" instead of "She came first ...".

 

[jutfrank]

I'd suggest:

Mary was top of the class.