Ear Training Exercises are a collection of audio tracks you can use to help develop your Interval Ear Training - there are free lessons on the website that explain how to do it - these are test tracks.
Each track plays an interval 3 times (two are 'quickfire' test tracks where each interval is only played once!) and then I say the answer, so there's no need to write down answers and check them making it a lot easier to do it on a train or while walking the dog - literally anywhere! There are 10 tracks in total and a range of instruments including guitar, piano, electric piano, marimba and violin.
Volume 1 tests only the intervals of Unison, 4th, 5th and Octave - those in the Grade 1 Syllabus on the website!