Hello Faizan, 

You would get all the data about the examination on the official website of the examination board. 

The website of careers360 provides all other information that you need :

https://www.careers360.com/exams/indian-statistical-institute-admission-test

The link given below discusses all the patterns and syllabus of appearing exam :

https://engineering.careers360.com/articles/isi-exam-pattern-syllabus/amp#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s

Good luck. 

Have a bright future!!!