Really depends how you define "planning". I personally preferred just making a check list of stuff i had to do each day and crossed items off as i went, i knew my time limits and didn't have to really assign a specific time frame for each as long as i got everything done. Hence i found something like this site more than adequate
The timetable I used for the HSC exam period plus some other templates for a week Each session is numbered so I can assign subjects to a session View attachment 31277
Create a checklist for each session (I had 94-ish over 2 weeks)
A countdown timer/stopwatch useful for exams View attachment 31278
Two files, one is a older version of the above (full) and the other is an homework priority list View attachment 31279
Two files, not mine, edited, one is a schedule. One is a homework with checklist and flagging abilities. View attachment 31280