Experience or Karma spending is a little bit different post-creation.
Attributes can be increased above racial maximum post-character creation at 4 x New Rating
Attributes (up to Racial Max) can be increased at 3 x New Rating
General Skills can be increased at 2 x New Rating
Concentrations are at 1.5 x New Rating
Specialties and Languages at 1 x New Rating.
So to increase Strength from 5 to 6, you would need to spend 18 experience. But if you want to increase Strength from 6 to 7, it would cost 28 experience.
A new skill like Physical Engineering, you would spend 3 exp to go from 0 to 1 skill. To then get 1 to 2 skill, it would be 6 exp.