Not sure what the requirements are for your class. Best to ask your teacher this question.
Interval training is important. Play a note on the piano then sing a note that is an interval ABOVE this.
Intervals: minor 2nd, major 2nd, minor 3rd, major 3rd, perfect 4th, tritone, perfect 5th, minor 6th, major 6th, minor 7th, major 7th., octave.
After you sing the note, play the correct note on the piano. Hopefully you match.
After you get good, sing an interval BELOW the given note..