What's a good training regiment for ear training?

Do I just plow through song after song or will ear training software benefit me the most?

I have also come across solfege


And I am trying to incorporate it when learning songs

I have figured the nursery rhymes by ear though but I can't seem to grasp chords. I'm always wrong when guessing them.

I am practicing my major scales and minor scales alongside this whilst composing my own material.
The best ear-training regiment is the third Scots guards out of Aberdeen. They do daily interval training....
Sorry, couldn't resist...