It totally depends upon you. Now as the syllabus has changed if I was at your place I would have done both 50-50. But again it all depends on u. You can also do 60-40 or even 100-0, do what u want, its ur time and utilize it perfectly. I would recommend you to change from 50-50 to 60-40 to 100-0 (Pastpapers - textbook).