If you are animating start then animate end. You change direction by changing the way you animate properties of trim paths.
A quick search of "trim paths" in the search help field at the top right corner of AE brings up this link: Trim Paths Tutorial: This After Effects feature will change your mograph life!
You have to rearrange Groups under Contents. Groups on bottom will be animated first.
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In AE, just to the right of the Path Property are two buttons. These buttons allow you to reverse the path direction — use it.
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