Exemption banned

i am a pcc student nw converted ipc, in nov-12 i got exemption in tax, when i receiving mark statement it mentioned that "not eligible for any further exemption in any other paper of the relevent group/unit til may-14" only one subject grant exemption or what mean this? If i get any exemption in any other paper, can i cary fwd it to next chance, pls help i am totaly disappointed