給父母申請綠卡，遞交一大堆表格，文件，如何整理比較好？

So I'm submitting a thick pile of papers: application forms (I130, I485, I864, G325A, etc), and supporting documents, etc.  And I'm petitioning for both of them at the same time.  It's a pretty messy pile.  Can anyone suggest a good way of organizing so many forms, docs?  Thank you!!