Hi dear,
ISI entrance exam is conducted by Indian statistical institute. It organizes on a national level once in a year. The application date fore ISI 2020 will start in 8th February. You can check details here
https://www.google.co.in/url?q=https://www.careers360.com/exams/isi-admission-test&sa=U&ved=2ahUKEwjLtc3b6KHnAhXa63MBHRhRB_w4ChAWMAV6BAgBEAE&usg=AOvVaw0aTZupzX_XxjsJQEQ28TJr
Hope it helps.
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