The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
There is a test that is carried out by the Japan IPA(Information-technology Promotion Agency) called, "Applied Information Technology Engineer Examination".This application is intended to perform the study of the test. Question consists only question to memorize most of the past problems, there is no question to do the calculation.