Answer :
the best idea would be to store topics under subjects. (for example: science) then split them into more files and put them under projects, or section quizzes etc.
I WOULD PUT THEM UNDER IMPORTANT THINGS SUCH AS SUBJECTS THAT U NEED AND THAT MIGHT NEED LATER BUT INSTEAD OF PUTTING THEM ALTOGETHER TO MAKE MYSELF EVEN MORE ORGANIZED I WOULD SPLIT THEM INTO EVEN SMALLER FILES FOR PROJECTS AND THINGS LIKE THAT HOPE THIS HELPS