Let me start by saying very good job! Make sure to practice the use of the article "a" and "and" remember when a noun starts with a vowel sound we use "an" for example "an exam" "an important"

Another thing I noticed is the conditionals, when you use "if" and "would" the verb tense in the if clause needs to be in past example, "if you gave me the chance, I wouldn't let you down"

It is finally carnival in Brazil...
At this moment, most of Brazilian people are walking on the street with colorful clothes, dancing samba dance and other stuff. However, at this moment most of students are planning which subjects to study and which books to read, because at the end of the year we are going to do an exam called Enem. Which is a national exam that tests the students in Brazil. But, I am not just studying for Enem, I am also studying for an important and difficult test to get in a university. In Brazil, we must do a test in order to get in a university. Universities only choose the best students (the smart ones) to study a graduate course. I think if the university gave the chance to all students, maybe we wouldn't be a popular country with bad grades in education.
To get in a university you need to study hard, but most of students can't pay (or afford) a good school to get in a university. Well, I really do not like this way to study in a university.
Well, I will take this moment (carnival) to study some subjects that my teacher gave to me to study. Have a good carnival for all. :)

Carnival for me....? No.

It is finally carnival in Brazil...
In this moment, most of Brazilian people are walking on the street with colorful clothes, dancing samba dance and other stuff. But, most of students>most of the students or most students at the moment moment are planning which subjects to study and which books to read, because at the end of the year we are going to do a>an exam called Enem which is a national exam testing the students in Brazil. But, I have yet to study Enem, I am studying for a more important and difficult test to get in university. In Brazil, we must sit an exam before being accepted to university, if we want to do it. Our university just choose the best students (smarts) to study a graduate course. I think If the university give the chance to all students, maybe we wouldn't be a well-known country with bad quality of education.
To get in university you need to study very hard, but most students can't pay a good school to get in a university. Well, I really do not like this way to study in a university.
Well, I will take this moment (carnival) to study some subjects that my teacher gave to me to study. Have a good carnivel for all. :)