求翻译：据我所知，办理签证需要比较复杂的程序，到目前我还没有收到任何相关材料和信息。我比较担心的是，如果9月20日开学的话，不知道是否能来得及？不知何时能收到相关材料？是什么意思？

As far as I know, the visa require more complex procedures, I did not receive any materials and information. I am more worried about is that the September 20 school, do not know whether enough time? I do not know when it can receive the relevant material?

As far as I know, visas to more complex procedures, to the present I haven't received any related materials and information. I am more worried about is, if you started on 20 September, it is not know whether or not to be too late? We do not know when they will be able to receive the materials?

As far as I know, handles the visa to need the quite complex procedure, I has not received any correlation material and the information to at present.I compare the worry am, if on September 20 begins school, did not know whether can with enough time? Did not know when can receive the related materia

As far as I know, Visa programs that require more complex, until now I haven't received any relevant materials and information. I am worried about is that if you start September 20, do not know if I can in time? I do not know when to receive materials?

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