Its sure this time they selected paper 15 to kill d students. Not satisfied with the quality of this institute. They may give u 71 or 17 no logic.
They will give lengthy discussion on how to prepare for exam but its very difficult to found exemption rules. Earlier there was life time exemption n so many students never attended the exempted subject after result there was big chao as there was absent remark n many probable pass candidates failed.They neither intimate in exam form nor on hall ticket.
If you observe marks of any good candidate you will find 3 subjects nr.60 and one nr20.
For exemption details read backside of Marksheet. You may get group exemption just check is there min.marks criteria in other subjects.