1) Yes, you can, by all means, arrange for the funds before ITA.
2) A gift deed is an affidavit that is given by the person who gifted you the deed. It should mention that the money that has been given to you is an irrevocable gift and you are free to use it for any purpose.
3) "Borrow" or "Take a gift" ?
. If you are getting a gift from multiple people, then it is best to transfer all the funds into one account and then transfer that to your account. Multiple gift deeds would make your financial profile look weak. Transfer all the funds to one person (preferably parents) and then transfer that to your account and take a gift deed from your parents.