Even its was very hard for me to tell my heart that I cant perform weel if u go for 2 groups.
But I got a silly reason to convince my heart. it was" while paying exam fees for both groups my card got rejected twice.. later I just changed my application to 1 group & my payment is done" ofcourse using another card.
So I just convinced my heart "look even god is not allowing u to write both groups .. hahha.