Solfeggio or ear training depends on the teacher's habits. Our school practices solfeggio first.
The step of solfeggio is just to sing along with the music. Beginners start singing in the key of C, and gradually strengthen to the key of F\G and so on, just like the first point.
Universities in Guangdong generally practice their ears by solfeggio, and the first tune is estimated to be similar in other cities. If you seldom practice your ears, it depends on your personal level and habits.