Dear Vidhyesh,
As there is newly GST law is applicable , so practically no case law based questions will come in exam held in May18. Most probably direct questions will be asked in the examination. And now as you have filled the exam form of 2group u should study regularly all the three subjects [not everything can be prepared but whatever u r going to study that should be 100%] Go with the study material and previous 5 year exam papers. Go through with all the amendments and with RTP.
Wish you all the best!