Yes, REPERTOIRES is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, P 3, E 1, R 1, T 1, O 1, I 1, R 1, E 1, S 1.

Is it a valid word?

REPERTOIRES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the entire range of skills or aptitudes or devices used in a particular field or occupation
a collection of works (plays, songs, operas, ballets) that an artist or company can perform and do perform for short intervals on a regular schedule