So going with that my Wood Elf Cleric stats are:
STR: 12
DEX: 13
CON: 14
INT: 10
WIS: 15
CHA: 12
So given the Racial Bonuses DEX should go to a 15 and WIS to 16.
Just a small correction: You've actually spent 31 points here already, before racials.
Buying from 13 to 14 and from 14 to 15 costs 2 points each, not 1. Points cost the modifier of the new value, minimum of 1 point, so 8 to 9, 10, 11, 12 and 13 all cost one point each, while 13 to 14 and to 15 cost 2. Theoretically, buying 15 to 16 and 16 to 17 would cost 3, if it were allowed, and buying 17 to 18 would cost 4.
So:
STR: 12 (9, 10, 11, 12 = 4 points)
DEX: 13 (9, 10, 11, 12, 13 = 5 points)
CON: 14 (9, 10, 11, 12 , 13, 14(2) = 7 points)
INT: 10 (9, 10 = 2 points)
WIS: 15 (9, 10, 11, 12, 13, 14(2), 15(2) = 9 points)
CHA: 12 (9, 10, 11, 12 = 4 points)
Total: 4 + 5 + 7 + 2 +9 + 4 = 31 points spent.