As you can see that the attributes of a coach consist of
Attacking
Defending
Goalkeepers
Shooting
Setpiece
Ball Control
Tactical
Aerobic
Fitness
Menta
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.)