The following if-else statement that outputs the word High if the value of the variable score is greater than 100 and Low if the value of score is at most 100:

if( score > 100)
   cout << "High";
else
    cout << "Low";

Complete executable program code:

#include <iostream>
using namespace std;

int main ()
{
    //Declare the variable score is of data type int
    int score;
    
    //Read input score 
    cout << "Enter a score value: ";
    cin >>score;
    
    //Use an if-else statement that outputs the word 'High' 
    //if the value of the variable 'score' is greater than 100
    //and 'Low' if the value of 'score' is at most 100.
    if( score > 100)
        cout << "High";
    else
        cout << "Low";
    return 0;
}

Outputs:

Output 1:

Enter a score value: 125                                                                                                             
High 

Output 2:

Enter a score value: 60                                                                                                              
Low 

Output 3:

Enter a score value: 100                                                                                                             
Low