The school booklet says that "merit before choice".
Does this mean that even if I put school A as the last choice ie choice (6), and others put this school as the first choice ie choice (1), as long as my DC's t-score is higher, the school will still select my DC first?
Can anybody please confirm this?
Yes only if any of your school of your choice still has vacancy by the time the time your DC's turn to be allocated a slot in any of your 6 choices. All the 6 choices have equal weight.
One extreme example: if you put the 6 choices all IP tract school and when your DC's turn to be allocated a school slot but all the 6 schools' slots have been taken up then the allocation system will place your DC in any school nearest to your home which still has vacancy.
So it is better to be realistic in placing the 6 choices. The T-score is a queue number. The higher T-score child will have a priority for one of the 6 school choices the child put in the S1 Option form.
If anyone do not wish to go through this stressful process, DSA is the best choice to get your DC gets into the school of choice. But it is too late once results are out. Only can appeal to school of choice by placing it as first choice although you risk the chance of wasting one of the 6 choices.