Graph description

You did a really good job! There are some parts that aren't necessarily wrong but isn't the typical way people would write it. My version is below.

The bar graph shows statistics about where Technological University students chose to live between 1990 and 2010.

During the entire research period, the number of students who prefers to stay on campus remained at approximately 50%. Meanwhile, more students were choosing to live in a shared flat. The trend grew rapidly from 1990 to 2000 to 2010 by increasing from 15% to 23% to 43%. On the contrary, students who decided to stay with parents has declined noticeably. Starting at 35% in 1990 it dropped to 27% in 2000 and 5% in 2010.

In conclusion, sharing a flat became more ideal while living with parents became undesirable.

The weather (Please help me to correct it, tks)

This is good, I wrote my version below.

The sun was shining this morning, but it rained heavily this afternoon. Nonetheless, I had to go out. I couldn't hold my umbrella so all of my clothes got wet. I hope the rain has stopped now. 

It is a little repetitive to say it was sunny and the sun was shine in the same sentence. 

"Calm down, Mr. Geller." I said.  
"I can help you, I have a trick about writing postcards"
Mr. Geller becames happly at once,then I bring brought him to my house, and gave him a book called 《Postcards》.I told him he just needed to copy the text of 《Postcards》and replace the names.That's it.
Guees what? Mr. Geller wrote fifty postcards that afternoon. 
I saw Mr. Geller at dinner time again. He looks very well.
I went toward him, then Mr Geller say said hello to me, and gave me a 100 pounds for my help and gave me another 100 pounds wanted to buy my 《Proscards》. I readily agreed.
After a few days, Mr. Geller left. He said thanks to me again before he left.
Now I'm looking at this postcard on my hand, and feel a little touched.
"What a kind man!" I thought.

A postcard from Mr Geller.

For To complete this trail you need to take and care yours tools with you, like for example, camping tent, food, pans, your little mattress and clothes. Thus, it's important to remember to get with you just what it's needed, only take what you need otherwise you don't want to will get exhausted easily. Even because you'll already get exhausted because you need to walk up and down all the time. Especially because you'll already be tried from hiking. Actually, you need to make sure that you like to walk before going to this trail. But I can say that if you do it, it'll be worth.

We were compensated when we got reached our goal each day. Stoping on an at  amazing places and that are hard to reach, was a incredible and unexplainable thing. Enjoy the nature in the middles of the canyon during the night, and hear the sound of the river when you go sleep, and waking you up with to the birds singing is just amazing. So, some people maby think, that's it's crazy to do the "Fumaça por baixo", that it's how this way is called, but in the end it's worth it, because after so much efort, you have done something unique for you. Our highlight was when we reached the Fumaça's Waterfall from down, and we would have a Capoeira game there.

Chapada Diamantina - Fumaça's Waterfall by down (Cachoeira da Fumaça por baixo)

Today I want to write about Chapada Diamantina that stay is in Bahia. It's an incredible Natural Park with a good and mystic energy. I really love being there.

I went there twice. But I want to talk about my first experience. I was something about 22 years old, and I went there with a guy that I consider as my brother. He's called Marcelo and he is from Bahia, but before, he was living in Recife for while. We drove from Pernambuco to Bahia, due to on that day Marcelo was living in Pernambuco at the time. So as Since Brazil is huge big, we spent 11 hours driving away. Naturally, we had a pausa took breaks during the journey. At first day we arrived in Salvador and slept there one night.  We arrived in Salvador and spent the first night there.

The next day we drove more than five hours to Chapada Diamantina, and we stayed on at a place called "Vale do Capão", swapping the driver. It's a place where you can to do loads of trails and tracks around it. Besides, there are several waterfalls where you can go to relaxing andn enjoying the park. We decided to do a trail to Fumaça's Waterfalls, but it's harder going on the way down the cliffs, that it's harder, and you need to spend sleep two nights sleeping in the forest. It's a complex and hard way to get there because, at first, you need to reach "Fumaça por cima" before reaching "Fumaça por baixo".