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“You can not enter US before your mother enters US”不太理解，难道是我一定要回国签证吗？
-Not necessary. But if you do, you have to enter US together with your mother or after your mother enters US because your mother is the primary beneficiary, and you are your mother's derivative.

我现在还在美国上学，不希望回中国和妈妈一起签证，怕万一回不来。如果我妈妈先去签证，我现在需要准备什么？
-Prepare the documents for I-485 filing such as your birth certificate, the I-864 with the support documents from your mother's brother/sister who sponsored your mother, physical exam (I-693), copy of your I-20 and I-94, copy of your passport information pages including the F-1 visa stamp and entry stamp, etc. (see the I-485 Instructions).

I-485何时填写？
-You only can file I-485 after your mother enters US using her immigration visa (provide the copy of your mother's green card, copies of her immigration visa page and the stamp of her entry on her passport).

我现在需要准备DS260，
-No DS260 anymore.

出生证明等一系列材料吗？还有什么需要注意的，准备的东西，望8老师一并答复。