Hello Shivang,
After the JAM 2019 provisional answer key released, The candidates are given an opportunity to challenge the answers they think are wrong. This was available only in a time period specified by the conducting body.
To Contest the Answer Key dealine was 28-02-2019, 12:00 Noon.
To check the further information you can go through with the given below link.
https://university.careers360.com/articles/jam
Good Luck!
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