Object reference not set to an instance of an object

Hello,

I'm new to programming and I have some issues with a C# exercise I found online, and I can't understand the problem with my code. Every time I run it, it shows the problem: "Object reference not set to an instance of an object". I would truly appreciate it if someone can please help me.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Type the number of students that took the tests: ");
            int i = int.Parse(Console.ReadLine());
            Student[] arrStudents = new Student[i];
            for (int j = 0; j < i; j++ )
            {
                Console.Write("Type the name of the student: ");
                arrStudents[j].name = Console.ReadLine(); //this is where I'm  experiencing my problem, but I believe that all the code in this for loop is problematic
                Console.Write("Type the student's first test score: ");
                arrStudents[j].gradeA = int.Parse(Console.ReadLine());
                Console.Write("Type the student's second test score: ");
                arrStudents[j].gradeB = int.Parse(Console.ReadLine());
                Console.Write("Type the student's third test score: ");
                arrStudents[j].gradeC = int.Parse(Console.ReadLine());
            }
            Console.WriteLine("Here is the list of the students and whether they passed:");
            foreach (Student student in arrStudents)
            {
                if (student.Above90() == true)
                    Console.WriteLine("{0} ----- PASSED", student.name);
                else if (student.Above90() == false)
                    Console.WriteLine("{0} ----- DIDN'T PASS", student.name);
            }

            Console.ReadLine();
            
        }
    }
    class Student
    {
        public int gradeA { get; set; }
        public int gradeB { get; set; }
        public int gradeC { get; set; }
        public string name { get; set; }

        public Student()
        {
            this.name = ".";
            this.gradeA = 0;
            this.gradeB = 0;
            this.gradeC = 0;
        }

        public Student(string Name, int ScoreA, int ScoreB, int ScoreC)
        {
            this.name = Name;
            this.gradeA = ScoreA;
            this.gradeB = ScoreB;
            this.gradeC = ScoreC;
        }

        public bool Above90 ()
        {
            if ((this.gradeA > 90) && (this.gradeB > 90) && (this.gradeC > 90))
                return true;
            else
                return false;
        }
    }
}

I know it's not exactly the best coding, but I wanted to use everything I have learned so far.

Thank you in advance :-)