desetka

1. ten; the number ten
   Na kraju reda napiši desetku. — Write a ten at the end of the line.
2. colloq. (of a bus, tram, card, player) number ten
   Do centra idem desetkom. — I take the number ten into town.
   Imam dve desetke u ruci. — I've got two tens in my hand.
3. (at university exams) a ten; top grade
   Dobila je desetku iz statistike. — She got a ten in statistics.
4. (in shooting) bullseye
   Strelac je tri puta pogodio desetku. — The shooter hit the bullseye three times.

Serbian universities grade from 5 to 10, so desetka is the top mark.