Skills
Weight 30%
What it measures
Whether you hold the capabilities this specification actually asks for. Scored against the requirements as written, not against the job title. Two adverts for the same title routinely produce Skills scores twenty points apart.
If this is your lowest
It is a training problem and there is no shortcut. Take the two biggest gaps, follow the prescribed free route, and rescore when you finish. This is the only dimension where the honest answer is sometimes "not this quarter".