if you enroll for both groups, yes you can. There is no substitute for hard work. By only with your efforts and hardwork, you can easily achieve success.
If u registered for both groups,then you can definitely give & crack them with ur efforts..
Writting both groups at the same time is not a big deal. It's on you and your level of preparation.if u have prepared from the day 1 by keeping in your mind that i'll apear for both groups, then you might have developed that level of confidence,will power and so on....hence u can only better decide which way to choose.....!!All the best...!!