REJECT for the hundredth time, HELP to understand PLEASE !!!

> Reject for the hundredth time, help to understand

I have many times sent their work on “Graphic River” and received a rejection.

I can not move on until I correct my mistakes!
But the fact is that I do not know what mistakes to correct.

Taking into account for Designer:
-instructions written
-sizes are met
-file download process - such as must to be

My assumptions:
-Perhaps That something is wrong with the instruction to the client, or it does not complete?
-Can I have no layers beautifully signed?
-Can CMYK colors should not exceed 250 of the total paint?
-Maybe It was very important that each color business cards must be in a separate folder, and not in layers?
-What else?

Each council will be very useful to me!