Bengal has been impressive in the tournament so far as they registered their fourth consecutive victory in the East Zone league today.
Tiwary first scalped four for 23 with his part-time leg- breaks and then went on to score an unbeaten 63 off 53 balls to ensure the comfortable win for his side.
Opting to field, Bengal first restricted Assam to modest 143 for nine and then chased down the target with 17 balls spare.
Later Tiwary also starred with the ball and spearheaded Bengal's chase with his unbeaten knock that was studded with eight boundaries and one hit over the fence.
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Besides Tiwary, Anustup Majumdar (34) and Writtick Chatterjee (31) also made useful contributions with the bat.
Off-spinner Swarupam Purkyastha picked up two wickets for Assam.
Bengal are now comfortably placed 16 points from four wins out of as many games, while Assam are yet to taste a success.
With one match to go in the East one League, Jharkhand are now placed second behind Bengal with 12 points.
Despite the loss, Odisha, with eight points, are still in the fray as a win in their next match can turn the tables around for them.
Electing to bat, Odisha rode on Govinda Poddar's 64 of 422 balls to muster only 123 before being bowled out.
Right-arm pacer Monu Kumar was the star for Jharkhand with figures of four for 14.
Brief Scores:
Assam: 143 for 9 in 20 overs (Rishav Das 53; Manoj Tiwary 4/23) lost by 6 wickets to Bengal: 147 for 4 in 17.1 overs (Manoj Tiwary 63 not out).
Odisha: 123 all out in 19.4 overs (Govinda Poddar 64; Monu Kumar 4/14) lost by 8 wickets to Jharkhand: 129 for 2 in 16.4 overs (Ishan Kishan 51, Ishank Jaggi 40; Debabrata Pradhan 1/15).