Yes, ORGANIZE is a Scrabble word!

Letter values in Scrabble US: O 1, R 1, G 2, A 1, N 1, I 1, Z 10, E 1.

Is it a valid word?

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

create (as an entity)
cause to be structured or ordered or operating according to some principle or idea
plan and direct (a complex undertaking)
bring order and organization to
arrange by systematic planning and united effort
form or join a union

Also: get up.