It gives the bonus to individual improvement rolls depending on the number of dedicated POW points spent on the gift.
1 POW = 1 IR, 3 POW = 2 IR (1 POW for the 1st, 2 POW for the 2nd) and so on. Once you've used the gift I would say it's gone.
I would say you are reading that wrong. One use for a point of dedicated POW!
It is defining how many skills that the enhanced learning effects.
1 POW dedicated to permanently improve rolls on one skill.
3 POW dedicated to permanently improve rolls on two skills
6 POW dedicated to permanently improve rolls on three skills
Otherwise it's just stupidly expensive on POW for very little return, look at the other gifts.