ISI admission test is performed once a year only, for details see Advertisement for Ph.D. at ISI
However, external funded candidates (CSIR/UGC/INSPIRE) may be enrolled twice a year (in December and June), subject to availability of sufficient number of candidates.
External funded candidates are requested to apply to the Dean of studies
with CV and copies of all the documents, mentioning the name of the unit and the prospective supervisor. We will get in touch with them in due course.