HOA3!!

int choice, quiznumber;
            double classStanding, sumofscores, sumofHPS;

            choice = 0;
            List<int> scores = new List<int>();
            List<int> HPSs = new List<int>();

            while (choice < 5)
            {
                Console.WriteLine("------------------------");
                Console.WriteLine("1 - Add Quiz");
                Console.WriteLine("2 - View Quiz");
                Console.WriteLine("3 - Corrections");
                Console.WriteLine("4 - View All Quizzes");
                Console.WriteLine("5 - Exit");
                Console.WriteLine("------------------------");

                Console.Write("Enter choice: ");
                choice = int.Parse(Console.ReadLine());

                if (choice == 1)
                {
                    Console.WriteLine("NEW QUIZ");

                    Console.Write("Enter score: ");
                    scores.Add(int.Parse(Console.ReadLine()));

                    Console.Write("Enter HPS: ");
                    HPSs.Add(int.Parse(Console.ReadLine()));

                    Console.WriteLine("Quiz " + scores.Count + " successfully added!");
                }
                if (choice == 2)
                {
                    Console.WriteLine("VIEW QUIZ");
                    Console.Write("Enter quiz number: ");
                    quiznumber = int.Parse(Console.ReadLine());

                    if (quiznumber <= scores.Count)
                    {
                        Console.WriteLine("Score: " + scores[quiznumber - 1] + "\tHPS: " + HPSs[quiznumber - 1]);
                    }
                    else
                    {
                        Console.WriteLine("Quiz " + quiznumber + " does not exist.");
                    }

                }
                if (choice == 3)
                {
                    Console.WriteLine("CORRECTIONS");
                    Console.Write("Enter quiz number: ");
                    quiznumber = int.Parse(Console.ReadLine());

                    Console.Write("Enter new score: ");
                    scores[quiznumber - 1] = int.Parse(Console.ReadLine());

                    Console.WriteLine("Quiz " + quiznumber + " has been successfully updated!");
                }
                if (choice == 4)
                {
                    Console.WriteLine("CLASS STANDING");
                    for (int i = 0; i < scores.Count; i++)
                    {
                        Console.WriteLine("Quiz " + (i + 1) + "\tScore: " + scores[i] + "\tHPS: " + HPSs[i]);
                    }

                    sumofscores = (scores.Sum() / scores.Count);
                    sumofHPS = (HPSs.Sum() / HPSs.Count);

                    classStanding = (sumofscores / sumofHPS) * 100;

                    Console.WriteLine("Class standing: " + classStanding);
                }
            }
            if (choice == 5)
            {
                Console.WriteLine("Exiting the app...");
                Console.ReadKey();
            }