Writing code in c utilizing imported data from a tsv file

Question

Question Prompt1

I am very new to C and I didn't really understand this chapter in my text book. This is the final version of my code that I have written, although, I have been at this for 3 hours straight.(p.s. some of the code is intentially surrounded by slashes because of testing purposes.)

#include <stdio.h>

int main(void) {
   
   FILE* StudentInfo = NULL;
   FILE* Report = NULL;
   int x = 0;
   int Reader = 1;
   const int STUDENT_LINE_INFO = 50;
   char studentGrades[STUDENT_LINE_INFO];
   char firstName[25];
   char lastName[25];
   int score1;
   int score2;
   int score3;
   int studentAvg;
   /*int midterm1;
   int midterm2;
   int final;*/
   
   StudentInfo = fopen("StudentInfo.tsv", "r");
   
   while(fgets(studentGrades, STUDENT_LINE_INFO, StudentInfo)) {
      printf("%s", studentGrades);
      sscanf(studentGrades, "%25s %25s %d %d %d", lastName, firstName, &score1, &score2, &score3);
      studentAvg = ((score1 + score2 + score3) / 3);
   }
   printf("%d", studentAvg);
   

  /* Report = fopen("report.txt", "w"); 
  
   fprintf("%s", studentGrades);
   fprintf("Averages: midterm1 %d, midterm2 %d, final %d", midterm1, midterm2, final); 
   
   if (x >= 90) {
      fprintf(Report,"A");
   }
   else if ((x < 90) || (x >= 80)) {
      fprintf(Report, "B");
   }
   else if ((x < 80) || (x >= 70)) {
      fprintf(Report, "C");
   }
   else if ((x < 70) || (x >= 60)) {
      fprintf(Report, "D");
   }
   else {
      fprintf(Report, "F");
   }
   fclose(Report); */
   
   return 0;
}

I need some help please. I know this code is uncomplete but I dont know if it is even remotely close to what I need to be doing. Is this even the right approach?