You don't need to prepare much about that interview is so easy
1- Singleton pattern (with thread safe ) and you should know about each keyword used in that and why like sealed, private, static etc,
2- difference between ref and out where to use whom
3- how implement 2 different interface with exact same method in a class and how to use them
4- Angular life cycle
5- Angular Guard
6- Switch map , observables
7- Project understanding very imp
difference between interface vs abstract class when to use whom