Just two minor remarks:
my $totalmarks = reduce { $a + $b } @marks;

If you resort to List::Util (Which isn't a bad idea at all) you can just as well use sum @marks.

my $fullname   = "";

Since you don't use it, you don't have to declare it.

In reply to Re^2: Students Rank calculation for the below perl script by moritz
in thread Students Rank calculation for the below perl script by valavanp

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