$control = @score; should be $control = $#score + 1; to get the size of the array (I believe that's what you're trying to do...

As said before, $names[$sub-1] = $tem; should be $names[$sub-1] = $temp2;

You also have an error in this for loop... (You need to use your $ctr, and reset it to 0 before the loop.)

$ctr = 0;
foreach(@score){
    $total += $score[$ctr];
    $ctr++;
}
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The average score should be ($total / $control) or ($total / $ctr), lowest test score should be $score[0], and the highest should be $score[$control - 1] or $score[$ctr - 1]

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print(map(lc(chr),split(6,qw/99672682673683684689632658645641610607/)));