Pls help - ipcc group 2 number of attempts after clearing gr

i gave ipcc both groups in may 2011, cleared my ipcc group 1 in may 2011, gave group 2 in nov 2011 but cud not clear..i didnt appear for group 2 in may 2012..im appearing for group 2 in nov 2012...how many attempts can i give for group 2?? after a specific no. of attempts will my clearing of group 1 be nullified?? pls reply asap