Education - each correction will be appreciated

There has been no doubt that in recent years the level of education among school children has been significantly aggravated** (diminished? disrupted? ). Many children spend a [lot of] time on the social media and with friends. They are not focused on their educational pursuits and homework. What is more, teachers also [have not enough]*** good qualifications to teach their students effectively. There has been a significant amount of research on this subject during recent years, which indicates that 75% of young people do not have any future life objectives (**goals, pursuits, plans). If they had an educational goal, they would try to do more to achieve success**.

It is a universally acknowledged fact that many teachers [have not enough]*** qualifications to teach children at school. As impartial research shows, 55% of teachers have changed their qualifications after graduating study. This phenomenon demonstrates that current teachers had others goals during their study. If they had planned to become teachers during their studies, they would be better prepared to do their jobs.

Of course, accurately predicting the future is practically impossible to do, but it seems to be obvious that serious steps must be taken to improve the educational system immediately. Firstly, more money should be spent to encourage the best students to become teachers. Furthermore, a special public office must be appointed to focus more effectively on the current educational problems. Finally, teachers should be awarded for their jobs and a well-paid salary should be provided.

**what word in Polish would you use here? Perhaps there is a better translation than 'aggravated'.

***[have not enough] the rules may be different for BrEng, but in AmEng we would say [do not have enough]. However, it looks correct, but sounds strange (to me).

**Success fits better here, in my opinion. You could also say "...they would do more to succeed."   

"baking" here functions as an adjective. "He was baking" means, "He was very hot (to the touch)". From Wiktionary: Adjective (figuratively) Of a person, an object, or the weather: very hot; boiling, broiling, roasting. I'm baking – could you open the window? The car was baking after having been parked in the sun the whole afternoon.

Hi, I'm looking for someone who'd like to help correct my mistakes in below essay.

Zoos

There are a lot of zoos all over the world. The reason most zoos are in bigger cities is that more people visit such places and buy tickets, therefore  a management can pay workers and provide food for animals. Zoos don’t usually generate lots of money, and I think many zoos are placed in big cities so that they don't go under*. If you visit the aforementioned places, you can see many species of animals, from big elephants to small birds. Many opinions are stated about zoos. Some people think they shouldn’t exist, to some it doesn’t matter, and some would love to visit such places on daily basis.
If animals are not in their natural environment, they don’t feel very comfortable, and space in zoos is not enough for them, even if it resembles the natural world. We shouldn’t compare people to animals, but try to imagine people living in closed, small cage, like in prison. Those animals have smaller brains, but looking at the grimace of their faces you won’t see the feeling of freedom.
We all know we really can’t remove zoos from the world, but we can monitor most of these places, and send inspectors to see if the animals are treated with consideration. People are curious about the world, and they want to see new species of animals which come from other countries.  
In my opinion, zoos shouldn’t exist. However, if the animals are treated properly, and the workers of the zoos, and other people, respect their rights and don’t make their sad lives worse, then some rare species that are not seen in the surrounding environment may be viewed in reality, rather than only in pictures. and are being showed may be put in to reveal the truth from pictures. -- What I mean to say is, that somebody who has only seen a picture of an elephant can now see one in reality. (this last sentence was very long, I hope you understood the message)

*go under = go out of business, get run down, run out of money