Finding reliable, free materials shouldn't be a struggle. Several reputable platforms offer "Reussir Le Delf B1" style audio files specifically designed for exam preparation.
TV5Monde: Their "Apprendre le français" portal features a dedicated DELF B1 section with interactive listening exercises and downloadable transcripts. Reussir Le Delf B1 Audio Download Free High Quality
Read the questions first: Use the 30 seconds of silence to predict what information you need to find. Finding reliable, free materials shouldn't be a struggle