Being a Board exam, it is very important to score high in XIIth Std. And good thing is that it is easier to score high in XII Commerce while comparing to XII std. in other streams. Need is to focus properly in each lectures and do the practice on your own. Further expert professors know precisely where students loose marks and what needs to be done in order to save marks. So experience and quality of professors is extremely important here. Also students in XII commerce have enough time for extra practice and more paper solving which finally leads to higher marks in Boards.