print Dumper $HoH{'Student2'};

__END__

$ perl test.pl in.txt
$VAR1 = {
          'final' => '0.033',
          'quiz' => '0.001',
          'exam' => '0.007'
        };

##</code><code>##

print $HoH{'Student2'}{'final'} . "\n";

__END__

$ perl test.pl in.txt
0.033