Hello arvind,

International English Language Testing System (IELTS) British Council, IDP-IELTS Australia and Cambridge English Language Assessment conduct the IELTS 2019 test to evaluate a candidate’s proficiency level in the English language, IELTS 2019 measures a candidate’s English language command in four different skill sets, namely Listening, Reading, Writing and Speaking,so english is the subject which is required for ielts exam.

Hope this helps