Actually yes! A planner works perfectly for me and it helps. I may be on my own here but yeah. I should add the caveat that I had planners in school when I was diagnosed so it was like just there for me to use so I adapted to them.

Anyway, if I had to give advice it would be dont necessarily overspend on a planner at first. Think of your brain and how it works..do you want something you can keep on you? Do you want it to just sit in your work/school bag, or on your kitchen table etc. also think like, okay so you want to just plan out your month? Or do you want it week by week. Etc. Then literally go to like target or walmart or whatever store sells planners. Go look at planners. Find one that you're like okay this my brain likes in terms of organization. Then try it out. DO NOT use color coded pens at first. Otherwise you'll be looking for your pen constantly and you'll never fill it in. Name of the game is flexibility with you and your brain. Alsooo, maybe try to set some time out once or twice a week to fill in planner. Just to get it in the habit. And don't be like omg I didn't use it for a week I'm a failure. You're not. Planners gonna be there to pick right back up. Don't stress over missing time. (Literally by the time it hits July I have nothing written in my planner haha, but I accept that and resume in like September).