I can say u write both groups at a time and most probely prepare first grp and go for short read of grp 2 also..
Through the RTP's u can get minimum marks will support to u & if u concentrate on one subject u can had exemption also. So try to write both grps.
Don't be fear about exams and be confident on " u ".
All the best for ur Exams.
Best Regards,
Karthikeya...