Chirag also advised the opposition to accept the defeat gracefully and not to blame the EVM or election administration.
The EC said that its officials and its election machinery is carrying out counting with due diligence.
The 'NOTA' option on electronic voting machines, introduced in 2013, has its own symbol -- a ballot paper with a black cross across it.
As per the latest available trends, the AIMIM had taken a substantial lead from Amour, Kochadhaman, Jokihat, Bahadurganj and Baisi.
The BJP has outperformed ally JD(U) which has triggered speculations in some quarters if Kumar will still be the chief minister.
Despite the NDA leading the table, having won or leading in 125 seats, three more than the number required for a simple majority in the 243-member assembly, it's not done and dusted yet.
Siddiqui who represented Alinagar constituency in 2015 left it and opted for Keoti assembly segment in the current state elections.
Paswan's party has, however, been instrumental in the JD(U)'s loss in at least 30 seats, as per the latest trends made public by the Election Commission.
"We are in touch with our candidates and workers from all areas and the information received from them tells that results will go in our favour," the Lalu Prasad-led party said in a tweet.
In 2010, only the CPI managed to win a seat in Bihar while in 2015, the CPI-ML (Liberation) grabbed three seats as the other two Left parties drew a blank.
As trends from all 243 seats became available, the NDA constituents were ahead in 125, with BJP candidates leading the table in 72 seats and the JD(U) in only 47.
A crowd of Tejashwi supporters that had gathered outside the 10 Circular Road residence of former chief minister Rabri Devi expecting a victory is thinning now.
The case pertains to fraudulent withdrawal of Rs 3.13 crore from Dumka treasury when Prasad was the chief minister of undivided Bihar.