I've set up my timetable by putting in exams and the importance of each one - systems and control is same as all my science exams, and RS is less than all of these. However, when I click calculate my revision slots, it shows up all my revision to be mostly science and then the night before my systems and control there is a double revision - that's it! End of June. Nothing before!! How come? Does the system not recognise systems and control as being a revisable subject??