Here we discuss Intervals and Intervallic Relations, the exercise is to strengthen our ability to recognize intervals. Perfect Pitch is a rarity for humans, especially learning music late in life, this is how we, and many professional musicians compensate. The PDF can be Found Here.
Piano played through Musescore3: https://musescore.org/en/3.0
Some Ear Training Apps Tenuto is my preferred: https://www.musictheory.net/exercises/ear-interval
A blog with a decent list of the better tools out there: