During NEET PG counselling, candidates must present several important documents for verification. These typically include the NEET PG admit card, NEET PG scorecard or rank letter, MBBS degree certificate or provisional certificate, internship completion certificate, permanent or provisional medical registration certificate, photo identity proof, category certificate (if applicable), PwBD certificate (if applicable), and passport-size photographs. Candidates must ensure that all documents are valid and issued by competent authorities.