Yes, ORGANISE is a Scrabble word!

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

Is it a valid word?

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

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

Also: get up.