"It's been good to play in different weather conditions over the last few days. I was out there in the rain and wind in the afternoon [yesterday], and today when it was calm.
"The weather will be a huge factor here because there are not that many trees or things to block the wind, which could make it tricky."
Ko said she had rebuilt her confidence in recent weeks.
"I've been struggling for the last few months so it was nice to have those [top 10] finishes coming here.
"I don't think there's a miracle [turnaround] out there. It's hard when you know the pieces are there, but don't really know what's going on. The top 10 in Indianapolis [at the Women in Tech championship] gave me confidence for Evian.
"It's all about little things like confidence. I'm pretty sure within a couple of weeks my talent hasn't increased that much. It's just seeing putts drop and hitting fairways regularly."
Ko rated the 388m par-4 eighth hole as the hardest on the course.
"I hit a 3-wood into that par four today. The holes are so varied with the wind. Yesterday I used a pitching wedge into the green on one hole, then a 5-iron today.
"One day it might be a birdie hole; the next day you grab a par and run with it."
