The day started with a company presentation where they shared what the company does then salary structure etc
Try to focus on presentation as they might ask you questions based on that
Aptitude Round
Then 1St round started it was based on aptitude and coding questions
The aptitude round had almost 15 MCQ questions (CN,C++,DSA 5 each)
MCQ questions were very easy and if you have a good understanding of these subjects then you don't need any extra preparation still if you want you can practice MCQ questions on GFG
Then after that there were 3 coding questions all of them were easy-medium leetcode level questions.
Students who solved more than 2 coding questions(not sure about their selection criteria but try to solve all coding questions) were selected for the 2nd round.
Round I
It started with a general introduction and then the interviewer gave me a Linked list based question and one array based question both were medium level leetcode questions he was more focused on my code quality.
Round II
This was a managerial round where the interviewer was a very senior level druva employee he started with recursion based questions and then he asked about a project that i mentioned on my resume so be prepared and only mention project that you really have good knowledge of
Then he also asked a few behavior type questions like have you ever led any team in any contest or hackathon what challenges you faced(he was concerned about both technical and non technical challenges)
Both of my interviews went in DS and project related questions but many of my friends had questions on OS,DBMS and CN
Talking about any preparation you don't need any special preparation for druva as such just continue with your presentation and focus on CN.