Ranking is not that important at young ages so school will not do that. It is also very hard for kids to know the ranking at grade 1-6.
Grade 7-8 might award academic excellence award to students with each report card. In my kid's school, if you can get at most two A-, the rest have to be A or A+, then you will get the top award (principle excellence award). Or the next level is honored roll. Some did not get anything. ABC is not shown on grade 7/8 report card, but I can easily see the conversion. Kids will communicate across school to know who got principle award and apparently those are the top students in that term.