"Déanann sé staidéar ar leigheas éigeandála."

Translation: He studies emergency medicine.

[HupSkup]

I put in "he is studying" first time around and it was wrong ?

[SatharnPHL]

Irish and English both differentiate between the simple present tense (Déanann sé staidéar-"He studies") and the present progressive (Tá sé ag déanamh staidéir-"He is studying").

They aren't interchangeable.