That goes for every firm.

Just do your best, put in the extra effort and firm will acknowledge your hardwork and likely consider you for PPO.

Source?

If it is so, they would not be offering assessment.

Says who?

The firm hardly hires freshers. You have to be exceptionally good to get a ppo.

KCo Kolkata is on a hiring freeze right now

How frequently does KCO Kolkata offer ppo basis the performance in assessment insternship?