use strict;
use warnings;

use IO::All;
use Data::Dumper;
my @elements =();
my @lines = io('test_scores.txt')->chomp->slurp;
splice @lines, 0, 1; # remove first line

my %hash;

foreach my $line (@lines) {
    $line =~ s/^\s+//;
    my @elements = split /\s+/, $line;
    $hash{splice @elements, 0, 1} = \@elements;    
}
print Dumper \%hash;