The same case happen with me , i have submitted the second group in Feb, 2009 and 1st group sheet in this August, 2009. But no such case arise with me
Tell me one thing from where u have come to know that you have fail in ur GCL postal...
One more thing , In Feb, 2009 you must have submitted all the three compulsory paper , ask them did u failed in all theree paper, Even if u have cleared in one , then NO problem
If all of these does not work,
write a GCL paper and post it ( do not submit it to ICSI), and fill up your form , as if u have posted the paper before 31 August, and ig the paper did not reach to ICSI, it is postal department fault not your..
Lastly tell me where are u from , Kolkata ?