You need to put the school you want first on your CAF regardless of a review.
If the review isn't successful then, I'm sorry, you won't be considered for a GS place but you can appeal after March. AN appeal has to show the review was not FCO (fair, consistent and objective).
Even if I apply for the selection review, I presume that the results will not be known before 31st Oct. So, how does the process work?
Assuming review is successful, will the review results be shared with the concerned authority who are doing the school admissions and my CAF application will be considered with new score?