I cannot do a push-up but its required I do 13 in the military... any help/tips?

I'm joining the military and I cannot do a push up to save my life... In order to pass my basic training test I need to be able to do 13 or more. Does someone have any tips? Will they help me do push ups? Is there an acceptable easier way to do it so that I would be less worried?
I cannot do a push-up but its required I do 13 in the military... any help/tips?
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