vidyuthanand90 I agree with what
mkrishnabdrr has said. Additionally, if you are from India you can do one of the below ( as applicable)
a) Response taken from another post in this site from a person from India who wrote to INSEAD about English language requirements and got the below response.
"If you have completed your university degree in India, you only need your transcript as proof as Admissions Team understands that English is the medium of instruction across all universities in India. Taking an English test is not necessary."
OR
b) I have spoken to a current student who said the CBSE 10th records where English is a graded subject was submitted and accepted by INSEAD as proof.
OR
c) If your undergraduate degree was in English, you can request for a medium of instruction certificate from your undergraduate university and submit the same to INSEAD.
If you still have any doubts, I would suggest you to directly contact the INSEAD admissions for your particular case before re-taking any English language tests.