Causes and solutions of teenager's bad behavior which get them into trouble.

the problem of teenage deliquency

Behaving badly always make youngsters get into trouble.
There are various possible reasons why teenagers in some spots misbehave.
In this electronic world of smartphones and Internet, children are drawn far away from outside activities. In fact, it is necessary for teens to have a mobile phone so that parents can keep a track of their whereabouts. However, the use of these devices can turn into an addiction and lead to risky teenage behaviors. Furthermore, some films and video games contain high violent content can be accessed by teenagers without parent's monitor. This takes they to imitate like characters in those and it is possible that youth's mind can be affected. Finally, parents have less control over their children. In the past, families which were very close-knit and had more discipline for their children to respect their parents and follow their wishes. But in recent year, mother and father are too busy for their business so that they don't have much time to keep their eyes on children.

I think there are many solutions to this problem. First of all, the government must increase the number of sport and music centres for teens to relax after studying at school. Secondly, producers of movies and games have to raise awareness about the violent content in those. Thirdly, youth's parents should keep a close eye on their children to help them curb the issue before it blows out of proportion and encourage teens do more community worked as outside activities.

By and large, although there are other causes that affect equally, authority and everyone could take a hand in reducing the widespread problem of teenage deliquency.

This essay was written in haste and without proper consideration for proper paragraph formatting, clarity, and scoring requirements. You failed to properly restate the prompt and discussion instructions in your paraphrase section. There are no clear dividing paragraphs for the reasons and solutions that you are presenting in the essay. The response requirement was not fulfilled in the sense that you did not give an outline of the upcoming discussions in your reasoning paragraphs as a part of the last 2-3 sentences in your prompt paraphrase. The TA score for this essay will not be close to a passing score.

Your reasoning sentences in relation to the causes of bad behaviors do not produce coherent or cohesive explanations. There are only reasons given, no examples, no supporting data, no proper discussion presentation that could convince the examiner to believe your reasons. By presenting only a series of reasons with very little discussion development, your paragraphs are going to be seen as under developed with little explanation.

It would be better if you focus on limiting your reasoning paragraphs to one topic per paragraph. You can give 2 reasons in separate paragraphs or 2 related reasons in a single paragraph. The latter will require you to use connecting or transition sentences though. For beginner writers, I advise that you use the separate paragraph method instead. It gives you more room to develop your discussion in.

The solutions paragraph suffers from the same problems. Your solutions require justifications either through one supporting sentence and one example or a series of supporting sentences and examples. All of which must relate to the given causes in the previous paragraph. The IELTS Task 2 essay is scored on the the clarity of your explanation, based on your vocabulary, sentence structure, and presentation format. All of these requirements are difficult to find in your essay so you cannot expect to get a 5 band score with this type of presentation.

The discussion topics used are good. It is the example and explanation execution that is faulty. Those problems are what will prevent you from getting a passing score with this kind of presentation.

@ngocbich31
For IELTS essays you need to write an introduction paragraph.
For example:
1 Sentence - Restate the given prompt. The disruptive behaviour of adolescents has become a serious problem in many nations around the world.
2-3 Sentence - Tell what are you going to write about in the essay. Among the major causes are the lack of control from parents and the excess of violence in the media. To resolve this problem governments should create more opportunities for the young generation to express themselves and parents must be more involved as well.

Your second paragraph can be shorter and the third longer.
I do not completely understand how addiction to smartphones and the Internet can lead to risky behaviour. Probably you need to explain this point more. Or you can delete this part completely as I think two reasons like violence in the media and bad parenting should be enough for causes.

One sentence in conclusion is not enough, try to summarise your essay in 2-3 at least.

I think that is a hasty essay. You don't write the structure of the essay and don't meet the scoring demands.
I see you're doing some typos, using the wrong relative pronouns and typing words.
In my opinion, only two causes and two solutions should be identified and then focused on clarifying those. Furthermore, you should pay attention to the balance of the paragraphs.