To receive the maximum amount of the pell grant what efc number shous a student have? how is the efc number determined ？

I'm pretty sure to get the absolute maximum amount the EFC has to be 0 or really close to it. The EFC, or Expected Family Contribution, is mainly determined by your family's income. If your family has multiple students who will be enrolled in college, the number may be lower. It's not really about what number a student "should" have though, because the only way for you to lower it yourself is to lie, and you really don't want to do that-if you are found to have lied on your FAFSA there can be some serious legal consequences.

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