Hii Tanjilal!
Your question is not clear as such, whether you want to know how to read a timetable or how to make one or how to prepare it according to a certain exam. Kindly specify the question in detail. In order to prepare a timetable, you need to know the goal which you want to achieve, the syllabus, the time you have to prepare for it, your strong and weak subjects, then the time which you want to give to a subject. Decide a format and a grid and then make the timetable.
Hope this helps.
Good luck!