Have a read of this :
https://www.elevenplusexams.co.uk/schoo ... n-form-cafexplains about completing the form.
Key things to remember:
1) you will be offered the first school on the list that you are eligible for
2) you need to be rejected from a school to appeal
3) putting the local school second will not affect the chance of getting a place there, if you do not get the GS place then your second chiocie place effectively becomes your first
So if you really want the GS (and are considering appealing) but would be happy with the local school then it needs to be:
1.GS
2. Local school