Question

Why should you wait to revise until after you finish your draft?

Answer 1

so you dont miss somthing important

Step-by-step explanation:

so you don't accidentaly skip an error in the text that you make while writing / typing

Answer 2

Because if you finish your first draft and revise, your final draft will be exactly like your first draft.

Step-by-step explanation:

And that's probably gonna get you a zero, because your teacher may think you copied and pasted. Some teachers may also want you to do peer review. Anything can happen.