using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

public class Program

{

    public static void Main()

    {

            string dataUrl = "https://raw.githubusercontent.com/tester1-1/testdata/main/data.json";

            string jsonData = new WebClient().DownloadString(dataUrl);

            SubjectList subject = JsonConvert.DeserializeObject<SubjectList>(jsonData);

            List<Subject> subjectList = new List<Subject> {

                subject.class7,

                subject.class8,

                subject.class9,

                subject.class10,

                subject.classN

            };

​

            decimal maxMath1 = subjectList.Max(x => x.Math1);

            decimal minMath1 = subjectList.Min(x => x.Math1);

​

            Console.WriteLine("Math1 max value is: " + maxMath1);

            Console.WriteLine("Math1 min value is: " + minMath1);

            Console.ReadLine();

    }

    public class Subject

    {

        public decimal Math1 { get; set; }

        public decimal His { get; set; }

        public decimal Geo { get; set; }

        public decimal Eng { get; set; }

    }

​

    public class SubjectList

    {

        public Subject class7;

        public Subject class8;

        public Subject class9;

        public Subject class10;

        public Subject classN;

    }

}