Single group or both ca final

can u tell me whether i go for single group or both for nov 13 exams. first i decided to go for 1st group and preparation starts from last one month and completed 25% portion.now i saw time table of ca final so Meany hollydays came.thats way i want to go for 2nd group also .it is better decision or not or i go for single group. plz tell me ur suggestions.....