3 interview rounds:
Round 1:-
1- https://leetcode.com/problems/group-anagrams/
2-https://leetcode.com/problems/merge-k-sorted-lists/

Round 2-
1- little modification ( https://leetcode.com/problems/course-schedule-ii/ )
2- Modified ( https://leetcode.com/problems/subarray-sum-equals-k/ )
after - https://leetcode.com/problems/subarray-sums-divisible-by-k/
3- oops concepts

Round 3-
1- Projects ( Details )
2- LLD
3- Java concepts ( oops details )