Result:

Sample code 
    async getRemoteData(methodId = -1, param = -1) {
        if (methodId == -1) {
          let rawData = await fetch(this.url1);
          let text = await rawData.text();
          let array = text.split("\n");
          for (let line of array) {
            let veri = line.split("\t");
            let student = new Student(veri[0], veri[1], veri[2], veri.slice(3));
            this.StudentMap.set(veri[0], student);
          }
    
          let rawData2 = await fetch(this.url2);
          let text2 = await rawData2.text();
          let newArray = text2.split("\n");
          for (let line2 of newArray) {
            let veri2 = line2.split("\t");
            let course = new Course(veri2[0], veri2[1], veri2[2], veri2.slice(3));
            this.CourseMap.set(veri2[0], course);
          }
        }
    
        if (param != -1) {
          if (methodId == 1) {
            this.NumberOfStudentsAboveGPA(param);
          } else if (methodId == 2) {
            this.CoursesTakenByStudent(param);
          } else if (methodId == 3) {
            this.ExamSchedule(param);
          } else if (methodId == 4) {
            this.StudentList(param);
          } else if (methodId == 5) {
            this.CourseList(param);
          } else if (methodId == 6) {
            this.NumberOfCourses(param);
          } else if (methodId == 7) {
            this.CoursesInDate(param);
          }
        } else if (methodId == 0) {
          this.RandomStd();
        }
      }