[Vassago]

I read elsewhere that you are better off to complete the battle squares later b/c the xp you are given is set and if you finish it now, then you'll get less for the enemies that you have to fight. I've read that you can go back and complete the battle squares any time before starting chapter 4. Here is an example on how to beat all levels of a rank in battle squares. Red X to be completed last.

X is square beaten
0 is left alone

X X X
0 0 0 Rank 1 Level 1 beaten
0 0 0

X X X
X 0 0 Rank 1 Level 2 beaten
0 0 0

X X X
X 0 0 Rank 1 Level 3 beaten
0 0 X

X X X
X 0 0 Rank 1 Level 4 beaten
0 X X

X X X
X 0 X Rank 1 Level 5 beaten
0 X X