"Our Invidividual Subject is so vast and very difficult to secure 50% to alll students who are working in Pvt. companies day /night and still behind this kind of courses" it is a personal choice. Further, have you seen the rankers who work day in and day out yet study whenever they can and sacrifice everything.
You cannot have best of everything. So stop complaining about things that you cannot change and start doing something about the things that you can change.