Jack
请教个问题，关于ITA，mail里提到：
Please print the ITA and Additional Details Form and complete the necessary sections and send to informed branch (please refer to ITA letter) at your earliest convenience. Please also note that the ITA has an expiry date on xx-xx-xxx

请问我需要尽早把ITA和Additional Details Form先递交吗？还是等把所有材料准备齐再递交呢？谢谢！