Query on test papers cs executive

Dear members,

I Have registered CS Executive programme in Nov'2010, since then i didnt send any testpapers, can any body suggest me

when do i suppose to submit my testpapers now? (is there any last date for submission)

what papers do i need to submitt? (because in the material i found

testpapers for different years like 1/2008,2/2008....5/2008 test papers for Paper GCL & 1/2011,2/2011.......5/2011 for tax laws etc...