Revision timetables are useful because it makes your revision more organised and helps you revise each topic evenly. However, from my personal experience, after a few weeks of using the revision timetable, I began to not follow my revision timetable (not for any reason but I just started to forget about). Although revision timetables did not help me that much, it may help you so if you think this could help you or you want to just try it out, then do as you please!
Make sure that between each subject is at least a 10 to 15 minutes break. This is so that you can refresh your brain and be ready for the next subject!