Put in to bat by Assam, Jharkhand lost their top three batsmen below 100 runs before Tiwary and Jaggi steadied the boat.
Tiwary and Jaggi put on a solid 151-run stand together for the fourth wicket to take Jharkhand past 200-run mark.
But just before the close of play, Tiwary was dismissed for a well-made 88 off 174 deliveries that included seven hits to the fence and a six.
At stumps, Jaggi remained unbeaten and Rahul Shukla, who is yet to open his account, was giving him company.
Jharkhand 1st innings: 251 for four in 90 overs (Saurabh Tiwary 88, Ishank Jaggi 80 batting; Abu Nechim 1/28).
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