I assume you mean the MCMI-III? Like all empirically developed and normed personality/psychopathology measures its copyrighted, so it not available publicly, both for financial and test integrity reasons (APA ethics code 9.11 Maintaining Test Security). If your at a practicum site, ask your supervisor if they have it in the testing supply closet or whatever they have there. Does your psych department not keep assessment instruments around for grad students to use or learn on? You would want to read the manual if you actually learn about it though.