What I am going to say that i pass all the interview and got the offer letter from all the companies and I try to work in Start-Ups why because I needed to Enhance my skills and right now i an working on a small start-up for improving myself so i can be confident in future for major roles or projects.

Let me give some tips if you got the chance for the intervien in the company that i inlisted is :

They basically focus on the theory concepts like oops concepts , OS, System Design, programming also not that deep only basics

In Some certain cases they ask to program in my case I Explain some concept with help of programming. that give major plus point.

In anyway Try to be confident in every aspect and if you don't know something don't haggle just say that you don't know.

And always be confident.

Hope this could helpful.
Thanks.