The marks for general might range from 60-70 for science and for arts it gets to 50-55 for general externals. Also, it will vary to different categories. But still, on the basis of some factors, the range may increase and decrease every year. And sometimes the range for arts/humanities might rise.
The range is 50-55 and sometimes it might get 40-45 or 60-65 for general externals. Here, again the range varies.