Over 1.2 crore voters will seal the fate of 383 candidates, 33 of them women, in six north Bengal districts - Alipurduar, Jalpaiguri, Darjeeling, Uttar Dinajpur, Dakshin Dinajpur, Malda - and Birbhum in south Bengal.
The Election Commission had showcaused Mamata on April 14 for violating Model Code of Conduct.
Immediately after hearing the news, an unperturbed Mamata had dared the poll body to take action against her and said people of the state would showcause it on May 19, the day of the result.
In both the cases, the EC initiated action on the basis of complaints lodged by the Opposition parties.
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An elaborate multi-tier security arrangements have been made in these areas.
In the remaining constituencies, voters will get two hour extra and can vote till 6 PM.
The highest number of vulnerable booths are in the districts of Malda and Uttar Dinajpur.
Based on complaints received from the electorates, the poll watchdog has identified 16,315 voters as vulnerable. Most of them from Malda and Birbhum districts.