my $studentInfo = $sth_queryID->fetchall_arrayref;

##</code><code>##

for my $studentInfo_row (@{$studentInfo}) {
  next unless $studentInfo_row->[0] % 2;
  ...
}

##</code><code>##

foreach my $studentInfo_row ( grep { $_->[0] % 2 } @{$studentInfo}) {
  ...
}