Training mini guide and tips - The day after

[TropikThunder]

I'd use the drills with mostly important skills but one or two greys in it to make it more productive, like 1v1 finishing, set piece delivery, shuttle runs etc.

I agree. I would focus on the white skills until they get over 100, when they slow down. Then later go for the low gray skills since they will increase quickly (they are less important to the player on the field but they will increase his overall ability).