Just to answer the other part of the OP's question, in case it wasn't obvious from the above:
To work out the skill points needed until next skill level it's a similar calculation but using the next level as the multiplier e.g to get the first player to 22 he needs 66 (3x22) as a total skill grade. He's at 63.6, so he needs 2.4 improvement or 12 skill points
As a side note, if I was you and I had 40 skill points to give to player 2 I would put it into his skills instead of free kick SA (and judging by his value, he'll be the fastest trainer of the 3)