Our research aims to provide data on learning disabilities in students scientific branches, and the causes of failure and Dropout of university students. In this research, we focus on the study of the existence of delays in the completion of schooling, behavior and work and those among them affected by inequalities in their studies. 519 chemistry students belonging to the Faculty of Sciences Ben M’sik at the University Hassan II Mohammedia -Casablanca participated in the survey. They are aged between 17 and 23 years and suffer no physical or mental disability. The questionnaire consists of 101 questions grouped into 8 themes.Our results indicate the existence of students experiencing various delays in their academic careers, students are upset during exams as to forget things they know very well, student are affected by inequalities related to financial resources, work capacity, family networks, occupation and educational level of parents