[RonBee]

Re:

• The education they will get, will improve their annual income as a result.

Say:

• The education they will get will increase their annual income.

Or:

• The education they will get will result in an increase in their annual income.

Re:

• The economic benefits will be around US$28 billion. However, the improvement in children health is more important.

Say:

• The economic benefits will be around US$28 billion. However, the improvement in the children's health is more important.

Re:

• This study shows how important is the cooperation between the world countries in fighting child labor.

Possibly:

• This study shows how important cooperation is in the fight to end child labor.

I don't care for world country, as I don't think world is an adjective that defines country.


Re:

• One form of this cooperation is to fund the International Programme on the elimination of Child Labor (IPEC).

Possibly:

• One form of this cooperation is the International Programme on the elimination of Child Labor (IPEC).

:)