Ughh! No matter how you slice it, that's an icky problem. I try to avoid those nasty if-elsif-else statements with a hash table. japhy calls it a 'Dispatch Table', which sounds like a great name to me. The idea is that the keys in the hash point to subroutines: 

my %dispatch = (
     g6 => \&add_one,
     g7 => \&add_one,
     g8 => \&add_one,
     g9 => \&add_one,
     g0 => \&add_half,
     g1 => \&add_half,
     g2 => \&add_half,
     g3 => \&add_half,
     g4 => \&add_half,
     g5 => \&add_half,
     k0 => \&add_half,
     k1 => \&add_half,
     k2 => \&add_half,
     k3 => \&add_half,
     k4 => \&add_half,
     k5 => \&add_half,
);

sub add_one {
    my $total = shift;
    $total += 1;
    return $total;
}

sub add_half {
    my $total = shift;
    $total += 1;
    return $total;
}

[download]
And you access the table like so: 

my $total = 10;
$total    = $dispatch{'g6'}->($total);
$total    = $dispatch{'k5'}->($total);

print $total, "\n";

[download]
This is not a complete solution for you, but it is a start. 

----------------------------------------------------
 perl -le '$x="jeff";$x++ for(0..4482550);print $x'
----------------------------------------------------

In reply to (jeffa) Re: Efficient Rating of Test Answers by jeffa
in thread Efficient Rating of Test Answers by rvf

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