Alium - marks racers with high odds (x100, x50, probably no lower) if they'll be within top 2.

Calla - accurately marks racers that have not been marked with a double circle or a special mark by other predictors.

This one is hard to predict.
From Alium's prediction we know that x100 will be in the top 2 and x50 will not.
Nazuna predicts that x30 may win, which is a possibility since the racer's odds are too low for Alium to consider.
Taking away the two double-circle marks, Calla marked x10 as the highest place from the rest (still can be 1st).

I just used the rest of my votes for Alium, then Calla, then Nazuna.