As you can see that the attributes of a coach consist of
Working with Youngsters
The value of these attributes indicate the effectiveness of coach to train each drill.
The last attribute indicates how well he can train a youth player.
It is important to balance the number of players per coach as work overload of a coach diminishes the progression of training.
If a staff instructs no more than 5 players, he is being 100 % effective. You can check this easily by pressing the "Coach Detail"
tab of the "Training" menu. If the workload of a coach is proficiency, he is being 100% effective.
There are 4 levels of coach
1. 10,000 G
2. 100,000 G
3. 700,000 G
4. 120 credits (You can earn credits can by referring GoKickOff to your friends.)