The hosts finished say two at 107 for one after bowling out the visitors for 353 in their first innings.
"We have got to take each day one at a time, and to build on our position," said Cummins after the day's play.
"I can't give you any guarantee but hopefully we'll stick to our plans and come out victorious."
India recovered from a precarious 130/5 thanks to centuries from R Aswhin and Wriddhiman Saha, who put on 213 runs for the sixth wicket.
"The plan was not to bowl short but mix it up. Ashwin normally sits on the back foot, and a lot of guys sit on the back foot. So our plan was to get some balls up and let them drive and then use the short pitch stuff," he added.
"For me, the debut Test was very tough. Because, I was playing for the first time so nerves took in. I was fighting a long way, fighting hard, hard, hard. Then I came yesterday and saw the guys take wickets but didn't let that fluster me. I tried looking for wickets but my job was to build pressure," he said.
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