SimExams CBT software's exam engine module is availabe for iphones too so the candidates can take exams from their mobile phones. iOS application of exam engine is available for download from App Store.
This app includes all the same features as windows version of the exam engine. You can get a list of features of CBT Exam Engine Module here
Main feature of the app include adding the test modules, taking exam in learn mode or exam mode, saving results, reviewing saved results and analysis.
App can be downloaded from app store at : Download SimExams CBT Exam Engine iOS App
Some screenshots of the App, please click on image to enlarge: