The questions are basically from arrays, Mathematical , Dynamic Programming and algorithms
Tip 1 : For codevita, Practice coding problems daily from any website(eg: Leetcode, Hackerrank etc)
Tip 2 : Have confidence in yourself
Tip 1 : Make your resume good and add only those things in your resume in which you are confident enough to answer any question
Tip 2 : Description of your project should be short and sweet.