There are many answers to your question.
If the sum of the digits is 12 and the first two digits are 12, then
the sum of the last three digits is 12 - 1 - 2 = 9.
The last three digits are odd and they add up to 9. But there are
many ways to do this:
Each of these will give you an answer that satisfies all the conditions.
Hope this helps,
Stephen La Rocque.