This dataset provides a comprehensive collection of GNSS data gathered from Day of Year (DOY) 065 to 068, 2025 (March 6th to March 9th, 2025), designed for post-processing Precise Point Positioning (PPP) analysis, particularly focusing on the evaluation and utilization of PPP-B2b correction services. The dataset comprises three main types of data, organized into separate folders: High-Rate Multi-GNSS Observation Data (Obs/): Contains daily observation files from three International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) stations: gamg, ulab, and wuh2. Covers DOY 065-067, 2025. Data is provided at a high sampling rate (1HZ).The 1 Hz observation data, downloaded from MGEX in 15-minute interval files, were merged into daily files using gfzrnx (version 2.0-8219_win10_64). Files are in the standard Hatanaka-compressed RINEX observation format (version 3 assumed), using the naming convention SSSSDDD0.YYh (e.g., gamg0650.25h). SSSS denotes the station ID, DDD the DOY, and YY the 2-digit year. Includes observations from available GNSS constellations (GPS, GLONASS, Galileo, BeiDou, etc.) tracked by these MGEX sites. Multi-GNSS Broadcast Ephemeris (Nav/): Contains daily combined broadcast ephemeris files, sourced from the German Aerospace Center (DLR). Covers DOY 065-068, 2025. Files are provided in the standard RINEX navigation message format (version 4 assumed for brd4 prefix), using the naming convention brd4DDD0.YYp (e.g., brd40650.25p). PPP-B2b Correction Data (PPP-B2b(Unicore)/ ): Contains daily files of PPP-B2b correction data streams as logged directly by a Unicore Communications GNSS receiver. Covers DOY 065-068, 2025. Files use the naming convention YYYYDDD.B2b (e.g., 2025065.B2b), where YYYY is the 4-digit year and DDD is the DOY. The .B2b format represents the specific raw data stream logged by the receiver containing the corrections broadcast via the BeiDou GEO satellites.