BJP successfully managed to woo the traditional Congress vote bank of tea garden labourers and also made unexpected entry in certain minority-dominated areas.
In the 34 seats in Upper Assam, with 23 of these having a sizable tea garden population for Congress, the saffron party won 18 seats as against a presence of only two seats in the outgoing Assembly.
Congress, which had swept the last polls winning 30 of its total 78 seats from Upper Assam failed miserably to stop BJP upsurge managing to retain only seven seats and wresting one from BJP.
AIUDF sprung a surprise by winning Naoboicha seat,wresting it from Congress.
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In another major Congress bastion of the Barak Valley with 15 seats, BJP had no presence in the last polls though it later won a by-election from Silchar but in the just concluded polls it went on to win eight seats.
Congress with 13 seats in the last Assembly from the Barak Valley, managed to retain only three while AIUDF which had only seat went on to win from three constituencies.
In the 18 constituencies of minority dominated three districts of Dhubri, Goalpara and Barpeta, BJP made tentative forays winning four seats while its ally, AGP won two seats.
Congress with only three seats from these districts in the
last Assembly managed to woo the minority voters in this poll winning eight seats.
Congress was also decimated in the 14 seats of Central Assam's Morigaon and Nagaon districts, where there is a considerable minority population, retaining two seats and wresting one as against eight seats in the last poll.
AIUDF with four seats in the last polls managed to retain only two.
BJP also swept the ten assembly constituencies under both Kamrup Metro and Rural winning eight seats, as against one in the last polls, while Congress won only two seats as against six in the last polls.
The sway of BJP-led alliance continued in the eight seats of the Northern bank district of Sonitpur where the saffron party, with no presence in 2011, went on to win seven seats and its ally retained one while Congress, with six seats in the last assembly, failed to win a single seat.
The new Assembly will have only one independent MLA as against two in the outgoing Assembly.