Planner Apps:

• School Planner - https://play.google.com/store/apps/details?id=daldev.android.gradehelper&hl=en_US

School Planner - Apps on Google Play

• MyStudyLife - https://mystudylife.com/

MyStudyLife | Free Student Planner & Study App

Note Taking:

• A very useful list of note taking apps by my friend: Note-Taking and Task Management
• I would recommend keeping a digital note of stuff to keep track of things, a sort of master list, I use obsidian for this but you can use whatever you're comfortable with.