Accenture

The interview process comprises an aptitude assessment to gauge skills, followed by a technical round to assess expertise, and culminates in an HR round to evaluate cultural fit and soft skills.

I joined the interview, but it started almost half an hour late. They asked me about my project and basics of C++, along with a couple of questions on OOP.

Very good. You just have to get the basics of programming done along with Excel, quants, logic, and English, and you are good to go. I'd say one month is enough for preparation. Plenty of material on YouTube also helps.