You have to make sure that @thescore is declared outside of the loop. Otherwise, Perl, and nearly any other programming language, will see @thescore as having a local scope inside the loop only. Also, repeat the typical PM manta of using warnings and strict to run your code.

#!/usr/bin/perl -w

use strict;
...
my @thescore = (); #declare and initialize the array

if ( $score > 12 ) && ( $score < 100 ){
    push @thescore, $_};
    ...
}
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Also, in your code in the loop is looking for a variable called $thescore. The value you are trying to print will be in $_ instead. Here you can do two different things.

foreach (@thescore)
{
   print "$_\n";
}
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or

foreach my $thescore(@thescore)
{
   print "$thescore\n";
}
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