Hey Sudhanshu !
If you want to make any further changes in the order of preference before you can finally submit it before the deadline, you need to SAVE IT.
But if you are sure of your preference order and won't need any other changes to alter it, then you must LOCK IT.
After locking, you won't be able to make any further changes.
Even if you save it, before the deadline, you must LOCK YOUR CHOICES positively.

Hope this helps.

Good Luck !

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