one group or both group

I had appeared in November 2017 group one exam, but could not clear it. It was my 5th attempt of ca final and more mark get in only sfm with 63 marks.
In other paper I am fail, should I go for one group or both? I have not appeared in group two exam so far, because I was not prepared group two exam, but after this exam I have been reading some paper of group two, like idt self study, DT fast track batch.
I am hindi medium student, but I want to appear in may 18 exam with English medium, because I couldn't get more marks in audit or law. So we should go one group or both please suggest me.