What do you need help with? The writing?
I can tell you have a good grasp of English, but I think you are trying too hard.
The biggest problem is definitely with clarity:
1. Sentences are waaaaay too long. I am not going to spend 10 minutes rereading each sentence til I can connect the beginning to the middle, to the second middle, to the third middle, to the end. It�s really annoying.
And your sentences shouldn�t have a lot of verbs and subjects and objects.
This sentence has about 5 too many verbs (underlined) and about 4 too many subjects and objects (bold):
From base of this analysis was shown that the context of the educational reform stated on 90�s present and justified the elaboration of the guidelines in Brazil accompanied of the discourse combined of the changes which occurred in the organization and maintenance of the world capitalist system, this discourse was associated mainly through generality and flexibility.
Example of a long and hard to follow sentence:
This dissertation analyzed the process of constructing the National Curricular Guidelines for the Pedagogy Graduation Courses in Brazil established by the Resolution of the National Education Council � number 01,on May 15th 2006, from the identification of some ambiguities on texts written by the representatives of different historical projects which dispute the concept of pedagogy and the proposal of the training pedagogue on the referenced above mentioned process.
2. Apply lay-man termonology when it will suffice. AKA, use simple English when it works.
example:
From base of this analysis was shown that the context of the educational reform stated on 90�s present and justified the elaboration of the guidelines in Brazil accompanied of the discourse combined of the changes which occurred in the organization and maintenance of the world capitalist system, this discourse was associated mainly through generality and flexibility.
Might become:
From this analysis, it was shown that the context of the 90 �s educational reform justified the elaboration of the guidelines in Brazil, because they dealt with generality in the guidelines and added flexibitiy. However, these elaborations caused changes in the organization and maintenance of the world capitalist system.
Not sure if I said exactly what you were trying to say. Then again, I am not sure exactly what you are trying to say. You need to work on the clarity. Take care of these first two problems and I�ll be willing to take a second look.