Trending @Capgemini; Is it okay if i complete 10 days wfo instead of 12, or can i receive any warning mail?

You won't receive any warning mails but at the time of increment the HR might use that as a reason for low rating or bad increment.

I am receiving warning mails since February

If you're planning to stay in Capgemini until next year, go 12 days. They'll use this as a reason to lower your hike. Otherwise, 10 days WFO is pretty great.