Background:Training provided in medical faculties is mainly composed of two phases: preclinical and clinical. Preclinical period, or the first three years, consists of theoretical classes and practical implementations to develop vocational skills. In the clinical period, students are given applied courses.Objectives:This study aimed to determine the role of demographic characteristics and medical students’ life habits on their academic achievement.Patients and Methods:For this purpose, a 20-item survey form with two sections developed by the researchers was used. Students were also asked to identify the averages of committee exams as the academic achievement indicator. Participating students (n = 287) were from Mersin University Medical Faculty during 2012-2013 session.Results:Totally, 60.3% of the students were males with an average age of 21.16 ± 1.39, and their general grade point average was 63.39 ± 9.08. Students in their second year (P = 0.000), who were females (P = 0.000), graduated from Anatolian Teachers High Schools (P = 0.002), financially well off (P = 0.026), stayed in state hostels (P = 0.032), did not smoke (P = 0.042) and regularly did sports (P = 0.016) were significantly more successful compared to others.Conclusions:Students’ socioeconomic resources and habits play roles on academic achievement. Solutions that incorporate economic support which can eliminate negative situations leading to inequality of opportunity among students would increase students' achievement.