Hello, you must be a musician because you want to improve your hearing, I can advise you an excellent course on this website go. This course is designed, in particular, for intermediate and elementary level students. In general, if you are a complete mess in your ear training, this course will completely change your skills. However, if you are already at an advanced level and have trouble with very advanced harmonic contexts, such as harmonically complex jazz pieces involving lots of modulation and "atonal" playing, then this course was not specifically designed for you.