This tutorial is probably the best one available. Each module is interactive and includes stated goals at the beginning and testing at the end.
Students can email the results of their tests to a teacher or professor.
TILT was developed by a team headed by Elizabeth DuPuis at the University of Texas at Austin. The tutorials include practice exercises and are very clear and easy to use. The tutorial was developed by Paul T. Adalian, Jr., Sariya Talip-Clay, Sallie Harlan, and Judy Swanson at California State University. This tutorial from Ohio State University Library provides a very good introduction to Search Strategy. It covers the process from defining search terms to Boolean searching.