The main objective of this paper is to use data mining methodologies to find students which are likely to drop out their first year of engineering . In this research, the classification task is used to evaluate previous year's student dropout data and as there are many approaches that are used for data classification, the ID3, C4.5, CART and ADT decision tree methods is used here. Information like grade in High school, grade in Senior Secondary , student's family income,parents qualification etc. were collected from the student's management system to predict list of students who need special attention.