This minor scale is the relative scale to E major, and like it has two sharps. The teacher should thoroughly explain this scale. The pupil should practice this scale in all its possible modifications. Here is the piano fingering of C sharp minor scale (harmonic and natural).
C sharp minor key scale on the piano
E minor key frequently occurs in piano pieces and Ludwig van Beethoven’s Moonlight Sonata is the most famous example. In rock and pop music there are some well known examples: “You’re My Heart, You’re My Soul” by the Modern Talking, “Barbie Girl” (Aqua), “Whenever, Wherever” Shakira’s and The Rolling Stones’ “Gimme Shelter”