Randomizing questions on a quiz and calculating percentage correct in C

I am working on a simple C program to make a multiple choice quiz to help my students prepare for their exams. I used struct function. So far the program works fine

My question: 1)Is there a way to use my current code below to generate questions randomly?

2) How would you suggest keeping track of percentage answered correctly? (counter + for loop? while loop?

3) Is there anything I have done extremely inefficiently, can you recommend a solution? I'm genuinely a beginner so please not to complicated explanation. Thank you

Here's the code:

#include <stdio.h>


struct question
{
char quiz[130]; // Question will be stored here
char answer1[20];  // Text for multiple choice possible answer 1
char answer2[20];  // Text for multiple choice possible answer 2 ..
char answer3[20];
char answer4[20];
int correctAnswer;
};



int main (){


    struct question one={
           "Que significa la palabra 'ser'\n",
           "1. to do",
           "2. to be",
           "3. to make",
           "4. to understand",
           2,

    };
    printf ("%s %s %s %s %s\n",one.quiz,one.answer1,one.answer2,one.answer3,one.answer4);
    scanf ("%d",&one.correctAnswer);
    if (one.correctAnswer!=2){
                         printf("Equivocado! 'ser' significa: to be\n");
                         }
    else                 {
                         printf ("Correcto\n");
                         }
    struct question two={
           "Que significa la palabra 'poder'\n",
           "1. to do",
           "2. to read",
           "3. to make",
           "4. to be able to",
           4,

    };
    printf ("%s %s %s %s %s\n",two.quiz,two.answer1,two.answer2,two.answer3,two.answer4);
    scanf ("%d",&two.correctAnswer);
    if (two.correctAnswer!=4){
                         printf("Equivocado! 'ser' significa: to be able to\n");
                         }
    else                 {
                         printf ("Correcto\n");
                         }