First you need to identify number of OS that needs to be loaded

cat /boot/grub/grub.cfg |grep class |grep '(' |grep -n menuentry

1:menuentry 'Ubuntu, with Linux 3.2.0-63-generic-pae (recovery mode)' –class ubuntu –class gnu-linux –class gnu –class os {
2:menuentry 'Ubuntu, with Linux 3.2.0-63-generic (recovery mode)' –class ubuntu –class gnu-linux –class gnu –class os {
3:menuentry 'Ubuntu, with Linux 3.2.0-61-generic-pae (recovery mode)' –class ubuntu –class gnu-linux –class gnu –class os {
4:menuentry 'Ubuntu, with Linux 3.2.0-61-generic (recovery mode)' –class ubuntu –class gnu-linux –class gnu –class os {
5:menuentry 'Ubuntu, with Linux 3.2.0-58-generic (recovery mode)' –class ubuntu –class gnu-linux –class gnu –class os {
6:menuentry "Ubuntu, with Linux 2.6.32-51-generic (on /dev/sda1)" –class gnu-linux –class gnu –class os {
7:menuentry "Ubuntu, with Linux 2.6.32-51-generic (recovery mode) (on /dev/sda1)" –class gnu-linux –class gnu –class os {
8:menuentry "Ubuntu, with Linux 2.6.32-28-generic (on /dev/sda1)" –class gnu-linux –class gnu –class os {
9:menuentry "Ubuntu, with Linux 2.6.32-28-generic (recovery mode) (on /dev/sda1)" –class gnu-linux –class gnu –class os {

Please note that calculation in grub starts from the zero, so for example number of

7:menuentry "Ubuntu, with Linux 2.6.32-51-generic (recovery mode) (on /dev/sda1)" –class gnu-linux –class gnu –class os {

is 6

Update the line GRUB_DEFAULT=0 into the followin file

sudo vi /etc/default/grub

from
GRUB_DEFAULT=0
to
GRUB_DEFAULT=999

where 999 is number of partition that needs to be loaded first

Update your grub.cfg file by running:

sudo update-grub

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