This is the 11670th most frequent Polish word.
kolejni
"Next" or "subsequent" (plural).
The word 'kolejni' is used here as a plural masculine gender adjective, meaning 'subsequent' or 'following', describing the nouns 'uczniowie' (students).
Kolejni uczniowie wchodzą do sali.
Subsequent students are entering the room.
In this sentence, 'kolejni' modifies 'kandydaci' (candidates), indicating they are next in line or sequence in the event.
Kolejni kandydaci spróbują swoich sił w konkursie.
The next candidates will try their strengths in the contest.
Though 'kolejni' is not directly written, the phrase implies sequential occurrence, reflecting similar usage.