As Minchi1983 said, having one point doesn't mean you can increase any skill up by one rank. To increase say, Witchcraft, from rank 0 to rank 1 will cost 1 point, however to go from rank 1 to rank 2 will cost 2 points. Rank 3 will cost 3 points, and so on. So the higher ranks will require you to wait multiple level ups and save up the points to get them.
