How do movies or television influence people's behavior?- please check

[Savanna]

hi everyone, i'm Savanna and this is my very first time to write here something. i am preparing for National exams (that is what we call this in my country-Georgia). my exams are much easier than TOEFL and others.. so... well, if u can please correct. this is my fifth essay and i don't really know how to write it to get high marks. max mark is 16 and please tell me what marks could get this essay. (sorry for grammar and punctuation mistakes). :)

Nowadays, TV is very important thing in our life. Almost every family has at least on TV, and they spend hours watching it. Because of this, television has a big influence to us.
On the one hand, television is very necessary stuff for us. we get information about everything we are interested in, like weather, sport,politics, business and so on.. moreover,it helps us to relax when we are tired, we enjoy watching films, music videos, funny programs (also it is more pleasent, to do this with our family). besides, we can get educational information from TV channels like Discovery, National Geographic and others.. for example i have this channels on my TV and i have got a lot information about many interesting subject.
On the other hand, Television is very harmful for us. we spend hours watching it, meanwhile we become less active. we just sit on the arm-chair and watch it, the result is that we getting lazy. same goes for our mentality and imagination, we don't think anything, we don't imagine anything while watch TV. Also,it affects on our behavior,nowadays, most of films are violent, we watch many of them and time to time we will become more violent too. violence will be simple matter for us. more important is that children are affected by it than we are. for example, few years ago there were child who killed his own brother, when they asked him why did he do that, he answered that he had seen that in the films. this is the awful way TV can affect on us and we have to do something to stop it.
In conclusion, TV has advantages and disadvantages. anyway, it has more negative effects than positive. it has very bad influence on us. However, i personally think problem is that we can't limit our time of watching TV but we have to. if we will do that, i believe everything will be ok because one man said "everything, what is much is harmful" and i agree with him.

TOEFL listening lectures: A university arts lecture on Greek drama

[Savanna]

can someone rate my essay?