Yes, PREOCCUPYING is a Scrabble word!

Letter values in Scrabble US: P 3, R 1, E 1, O 1, C 3, C 3, U 1, P 3, Y 4, I 1, N 1, G 2.

Is it a valid word?

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

engage or engross the interest or attention of beforehand or occupy urgently or obsessively
occupy or take possession of beforehand or before another or appropriate for use in advance