After passing graduation, one can take admission directly to ICWAI. After 12 pass, one has to go for foundation course. The address of the ICWAI , institute is
12, Sudder Street, Kolkata 700016. One can purchase prospectuswhere every detail avaiable including admission form. Otherwise, You can have the prospectus through postal or through its regional office or chapters. Here is a link of the site of the institute.