Should i give ipcc 1st grp or both grp?

i m appearing for ipc nov 2015 i find grp 2 easier than grp 1 but I m really confused whether to give both or just grp 1 so that I can start article earlier?? anyone tell what's the benefit of giving grp wise n both grps??n one thing in order to avail exemption should I have to give both grp or ? plz suggest