The aim of this research is to diagnose on First Grade Level Students about an exact subject, Functions.
The current Examination of Accession to University in Turkey is not considerably accompaniant with French Bachelor and to succeed in this examination it is necessary to have a specail preperation in %93Course%94 (Dersane). Meanwhile this situation makes students unfamiliar with real mathematic practices and turn high school studies in to surface. At the same time this type of education system may later cause negative impacts on students university education.
This research comprises of four different analysis categories which include; curriculum analysis, analysis of textbooks of preparation to high school and university education, analysis of questions about functions that have been questioned in different years%92 examinations, analysis of questionnaire regarding the way that high school and Course teachers apply to teach the functions to their students, analysis of written exams that were applied to first grade students about Functions and analysis of questionnaire, which were applied to university students, about the education and the instruction of math.

KEY WORDS : Didactic of Mathematic, Examination of Accession to University, Functions, Analysis of Textbooks, Analysis of Student%92s Written Exams, Supposed Tool(Outil Supposé disponible), Real Tool(Outil Mobilisable), Level of Usage of Students%92 knowledge(Niveaux de Mises en fonctionnement des connaissances des éléves).