suggestion for upcoming exam

I would suggest you go with both groups. Time is enough if you prepare well.

With both groups (especially, in your case) the biggest benefit would be of set off. You can score 180-190 in one group and 210-220 in another one. You will clear.

Prepare for both the groups - Aim for exemptions in at least 3 subjects.  You will qualify with flying colors.

Best of Luck!! Study Hard!!