We present an adaptive system for training and teaching. Our system integrates an adaptive training environment and a cooperative environment for exams both accessible via Internet by standard Java-enabled browsers. In this paper we present details on the architecture, describe the project with regard to the adaptive self-training part, and report on an experiment that demostrates the effectiveness of the strategy: to draw attention of students to the topics they need to study. We experimented the system in a real case study with students attending a first year course, "Laboratorio di Informatica" of the Laurea degree in Computer Science in our University.