Your script just returns "Use of uninitialized value in print at thing line 8, <GRADE> line 1."

which probably means the file is zero bytes long (i.e. empty) <update> but more likely it means I've made a silly mistake. See ikegami's note below. </update>

update: Oh, and another point: always check the return value of functions; the script is more aptly written as

#!/usr/bin/perl -w

open(GRADE, "/home/jesse/Desktop/grades/history.txt")
    or die "Can't open '/home/jesse/Desktop/grades/history.txt': $!\n"
+;

while ($test = <GRADE>) {
    ; # do nothing
}
print $test; # print last line
close GRADE;
[download]

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}