The previous commenter gave lots of excellent points so I'll be bringing in points from a different focus.
A problem with timetables is that most examples show a rigid workflow and in experience it's easy to waste time on procrastinating, escapism, and being stressed and anxious and in turn miss some blocks of time you reserved for learning. This, depending on how you react, could shift all the plans up or make you skip the topics you're most stressed on (through repeated escapism for example) and tends to add onto the already accumulating stress -- if you catch yourself here then timetabling (not all timetables) may not suit you in the current moment.
Making a to-do list, for example, and working towards completing a list of tasks allows you the freedom for anything that crops up out of nowhere and could be more comfortable as it is more flexible, however if you are able to work with a timetable then two things: identify what makes it work, and that is a strength you should keep with.
Also before revising, you want to ensure you can still focus to an optimal degree in class; don't let forcing in a new timetable compromise on learning new knowledge.
As a priority, you should be maintaining your mental wellbeing as that translates to your ability to focus and do anything with your brain - including not zoning out and making "silly mistakes" in exams. The simplest way to do this is prioritising sleep or doing things with friends like sports.
You can start with this timetable here and edit it whenever you feel like there could be a better way to work: [I'm going to edit in the link when I'm done]