Extra 330 pilot had a NMAC on a training flight while returning to the airport in a descent from a local practice area. The pilot took evasive action to prevent a collision and continued to the airport to land.

Narrative

While returning from a training flight in the northwest VFR practice area of ZZZ on our way back into ZZZ1 I had a near miss on what could have been a mid-air collision. I had just completed an aerobatic profile in the northwest practice area. During the profile I had spotted a number of other training aircraft in the area and had made sure to deconflict during the entire flight. Upon completion of the maneuvers I began our descent while performing S-Turns to scan for traffic. I saw no traffic; so I continued our descent and turned towards ZZZ1. While flying southbound at approximately 6000 ft. I passed just under another training aircraft that was traveling East-West in the practice area. I did not even see them until they had passed right in front of us. I failed to properly monitor the CTAF frequency during the flight. Which could have potentially prevented the situation. However; after landing I did go over to the flight school of the aircraft I had the near miss with to apologize. The pilot of the other aircraft was a DPE on a check ride with a student; and they said that they never saw me either visually or on ADSB and were not even aware of the incident until I had told them about it.