You might want to keep track of things related to taxes, budgets, etc as a way to keep track of your spending. Always a good thing to do. Keep receipts as well.
Just about all my stuff from junior high and high school got thrown out when I was 19 and my parents moved.
When I was 35 and moved into a house I had bought, I threw out all my old financial records and old checks that were more than ten years old. I remember going through checks from my first year at college when I used to cash a check at the Student Union for $5.15 – $5 cash and 15 cent fee.
I keep paystubs/invoices and taxstuff. Never bothered to keep report cards.
When I was in college laptops were a rarity. And even for the people dumb enough to bring them into class they were shunned.
So I still have my hand written notes from college, and papers written, and tests. It fills up a few large boxes. I paid a ton for that knowledge so I hold it close.
Leave all of that bally hoo to my accountant, he’s acutely aware that he will be executed if he ever testifies against me in a court of law…just sayin ;-}