I was wondering if anyone knew of a question bank or practice tests for OOP questions on Hackerrank. The questions that I am referring to specifically are the MCQ questions in languages such as C++ or Python where you are given a list of functions and classes and then told to evaluate what is printed out by the program. These are often very tricky, and it would be nice to have a repository of questions to learn the general tricks and patterns.

An example would be something like the following in C++. The prompt would be to evaluate the output. I am looking for some really difficult examples that I can practice, especially in a timed environment.

#include<iostream>
#include<iostream>

using namespace std;
class Base1 {
 public:
     Base1()
     { cout << " Base1's constructor called" << endl; }
}; 

class Base2 {
 public:
     Base2()
     { cout << "Base2's constructor called" << endl;  }
};

class Derived: public Base1, public Base2 {
   public:
     Derived()
     {  cout << "Derived's constructor called" << endl;  }
};

int main()
{
   Derived d;
   return 0;
}

I am aware of there being a bunch of these on GeeksforGeeks. Curious if there are any other niche locations. Looking to practice these for the Old Mission OA, if anyone's taken that.

Here's what I have tried so far: Codewars - The problems labelled classes were either too complex to understand for me, or I found no actual need for implementing OOPS. None of the problems required you to create a class anyways.

Hackerrank - Just two problems in the OOP/ classes section ( don't remember what they exactly call them) and they two were hard math problems, so I need to first of all understand the complex maths concepts before I can get to programming.

Leetcode - Can't actually filter out problems based on OOP.