Well, if there is an assessment, you must first pass the test. Cuz if not, its sayonara

Well, I never did internship at KPMG so I am not sure whether they will ask technical questions. That aside, you should be prepared to answer questions like "Tell me about yourself", "What do you intend to achieve during your Y months of internship here?", "Tell me what do you understand about audit"....general questions like that. How you conduct yourself during the interview is of utmost importance. Do ask some questions abt the firm if you have the chance, that shows you are interested. Good luck