U must go for both grps. but be well -prepared with any 4 subjects so that your marks for all 8 subjects will set-off with each other.............Since , u have got less time...........use ICAI Compilers or Solved Scanner alongwith your references book..............
u shud go nov 10 attempt.. never give up... either u plan for both or single... take the help of scanner.. n good reference books...dont waste ur attempt...best of hard and smart work , always works...