India host the Kiwis for three Tests in Bengaluru, Pune and Mumbai from October 16 with crucial World Test Championship points on the line for both teams. "You feel like you can never score sometimes, that’s the hardest thing about coming here to India. The ball’s turning square, then the same sort of ball comes through and it skids on straight,” Guptill told PTI. "You never know which one’s going to turn and which one’s going to go straight, so you have to always be thinking, you have to always be mentally on song and on (the top of) your game.” India have won 17 consecutive Test series at home and New Zealand batters must make it count if they get set at the crease as conditions, Guptill said. "To try and get on top of India is extremely difficult. But when you feel like you are, you have to try and take that as long as possible in the game," the former NZ opener said. "It’s a tough place to play. It’s hot, sweaty and you feel like everything’s against you. But as I said, if you can get try and get on top of them and you feel like you are getting on top of them, you’ve got to try and go as deep as possible in the game." ‘India have depth’ Guptill also pointed out that have abundance of quality batters and bowlers who often double up as all-rounders, just as Ravindra Jadeja and Ravichandran Ashwin did in India’s 280-run win over Bangladesh in the first Test in Chennai. Jadeja made 86 while Ashwin scored a century and took six wickets in the second innings for a man of the match performance. So Guptill couldn’t pick anyone over the other, also pointing out pacer Jasprit Bumrah as a match-winner. "While Jadeja is probably the better batter, I mean, Ashwin goes about his work in a completely different way and is very effective in the way he scores his runs," he said. "So you never feel like you’re on top of India because they’ve got such depth, and then, obviously, you’ve got them as a partnership of the ball as well."