[Campus] Fairly basics OOPs concepts, Networking, DB, DSA mostly the basic ones. They'll ask for definitions you're understanding, and few OOPs based questions on DSA like trees or hash map again very basic ones if you have practice on leetcode believe me you'll get all questions they'll ask in one go. Try to remember that they do want a completed code but you need explain to make them understand how you are approaching you can ask for more details if you want too then in between they can ask to change something, or which can break your code so how you can fix it. Though your target remains the same to complete the code but still prepare for some questions and done, For HR round you intro and based upon you replies and fluency they can ask relatable questions.