I don't really have a timetable but I always follow certain study routine, i.e. 30 min bio, 30 min business, 30 min english reading, 30 min english writing and 1 hour maths.
personally, i dont believe study timetables work, they are mainly for people who stick to strict military routines, ive had a timetable before and i couldnt even stick to it for one day.