haha well my time management isn't the greatest but i'll try giving advice anyways
i don't really have a specific study timetable or anything, but i do have a to-do list because i find this is the most effective method for me. The most important thing about a to-do list is that you have to be realistic and sometimes realise that you won't be able to finish everything you wish to accomplish, so make sure to start on the highest priorities first and work your way down. also make sure to change your list as more tasks pop up, and possibly reordering things. i also do extracurricular stuff and dont know when i'm going to have time for my homework because sometimes things just pop up out of nowhere, but if you do dedicate to studies when you do have the free time, you should be fine.