Exit polls suggest Prime Minister Narendra Modi will win a landslide victory when votes are counted on Thursday.
The exit poll results have predicted that Congress's performance, although better than in 2014, will not be impressive.
Gandhi has responded to such questions by saying that he does not wish to "pre-empt the wisdom of the people of India" and that 'we must wait till May 23 to know the will of the people'.
Some of the polls listed projections for 543 seats although elections were held in only 542 as the Vellore poll was cancelled.
Issuing a recorded audio message for Congress workers, she said they should not fall prey to "rumours and exit poll trends which are being promoted to undermine the spirits of Congress persons".
Noting that the exit poll exercise was an effort to create a false impression of a wave in favour of one particular leader and his party, Kumaraswamy said undue importance should not be given to polls, which just give temporary numbers.
Some 900 million people are eligible to vote in the election, with results due on May 23.
The report noted that market is largely factoring in return of BJP-led (BJP) government.
Going by the exit poll predictions, one wonders whether Gandhi's statements are a veiled acceptance of anticipated defeat.
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Off-the-record though, party leaders, especially those who contested the Lok Sabha election, have been reiterating that oft-heard caveat about exit polls - "they have been wrong in the past".
Nationalist Congress Party (NCP) spokesperson Nawab Malik said that numerous exit polls results were contradicting themselves, so they lack credibility.
After a majority of exit polls showed that NDA would return to power for the second time, the opposition parties have lined-up meetings to strategise their plans to discuss the post-poll scenario.
"To me, this election is very much a battle between voter accountability and party organization", Sircar said. The BJP had won 71 and its ally Apna Dal two of its 80 seats in 2014. Outlook/MDRA, Aaj Tak-ORG MARG, NDTV/ Indian Express, Star/ C Voter, all projected that Atalbihari Vajpayee led government will come back to power with more than 250 seats. Jan Ki Baat put the NDA tally at 46-57 seats against 15-29 for the alliance.
West Bengal has the third largest number of members of parliament and has been hotly contested between the BJP and the Trinamool Congress, one of the most powerful parties in the coalition trying to unseat Modi.