noun
BAD : The college offers both science and art subjects.
GOOD : The college offers both science and arts subjects.
BAD : I worked as a tutor in the Faculty of Art and Social Sciences.
GOOD : I worked as a tutor in the Faculty of Arts and Social Sciences.
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Subjects of study are divided into the sciences (e.g. biology, physics, chemistry) and the arts (e.g. history, French, geography): 'If you don't like numbers, you should stick to the arts.'
The noun arts (WITH -s ) is often used in front of another noun: 'I'm studying for an arts degree.'