Yes, FOCALISING is a Scrabble word!

Letter values in Scrabble US: F 4, O 1, C 3, A 1, L 1, I 1, S 1, I 1, N 1, G 2.

Is it a valid word?

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

concentrate on a particular place or spot
bring into focus or alignment; to converge or cause to converge; of ideas or emotions
become focussed or come into focus
put (an image) into focus; we cannot enjoy the movie"

Not playable in Scrabble US: CONCENTRE.