Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
They asked about basic java concepts, about project work done and asked about C++ concepts.
Write code for JDBC connectivity with mysql
Basics of thread, java IO
What is JDBC, polymorphism, Inheritance?
Sample code on inheritance

Here's your problem of the day
Solving this problem will increase your chance to get selected in this company
What is recursion?