Could you please correct this composition please, I have an exam tomorrow and it is pretty important.

Adolescence is a transitional stage of physical and mental human development that occurs between childhood and adulthood. Teenagers are usually active, noisy, fun and like to try new things.
Nowadays parents work a lot of hours a day, spending few time at home with their children. Therefore parents try to give their children a lot of material things, such as games, electronic equipments and even money. Due to that children tend to feel that they don´t have to do anything to achieve something.
Youngsters have definitely become more envious and jealous of each other. They tend to use other people as objects. They pretend to be nice to some people when they want something from them.
As far as I´m concerned I think teenagers and parents should have an important conversation about their issues and discuss the problems they deal with.

Do your own homework.

-edit-

And just so I don't seem like a complete ass, I don't mind helping people. People that regularly contribute the forums I will do whatever I can to help them and will even often go out of my way to help the members I actually like. With you, you have a whopping 5 posts, I have no idea who you are, and I just assume you're here only to get help on your homework so I don't really give a crap about you at the moment.

Come back and ask for help again once you're actually a member of the community and not just some random kid who needs help on his English homework and I would gladly take the two minutes it would take to correct that.

I will help you once but you have to do your own work or you will fail life...

Adolescence is a transitional stage of physical and mental human development that occurs between childhood and adulthood. Teenagers are usually hyperactive, noisy and disruptive and like to be adventurous and experimental.
Nowadays, parents go to work for long hours everyday, spending not much time at home with their children. Therefore, parents offer their children a great deal of material possessions, such as games, electronic equipment and even money. Due to this, children tend to feel as though they don't have to do anything to attain belongings that they desire (Assuming that the term used is correct).
Young people have definitely become more resentful and jealous towards each other. They have a tendency to take advantage of each other. They often pretend to be nice to certain people, when actually the have an ulterior motive. As far as I'm concerned, I think teenagers and parents ought to have an in depth conversation about their issues and discuss the problems they are facing.

It's just simple things like "Things" which should never be used as a word in passages such as this.

BTW, English was my worst subject at school.

Also use spellingcow, just google it.