Method 1

/*
---------------------------------------------------------------------------------
  Method 1
---------------------------------------------------------------------------------
*/
#include <stdio.h>

int main(void)
{
    int marks, sum = 0, modCount = 1, stdCount = 1, high = 0, highstd = 0;

    while (stdCount <= 3)
    {
        while (modCount <= 4)
        {
            printf("Enter Student 0%d Module %d Marks: ", stdCount, modCount);
            scanf("%d", &marks);

            sum = sum + marks;
            modCount++;
        }

        printf("Student 0%d Total Marks = %d\n\n", stdCount, sum);

        if (high < sum)
        {
            high = sum;
            highstd = stdCount;
        }

        modCount = 1;
        sum = 0;
        stdCount++;
    }

    printf("Highest Total Marks = %d by Student %d\n", high, highstd);

    return 0;
}