Didn't work too hard in high school. Got by with 90+ average doing most of my homework actually in school. Took AP classes and was able to get 3-5 on them without much issue. All that said, I paid attention in class, I listened to every word the teachers said.
Didn't study for my SAT or ACT and got fine scores.
In college I never skipped class, graduated with a 3.55 or so. I interviewed to be a TA and I prepped more for this position than anything else I had done at this point in my life. I even got my accounting professor at my college to lend me some students for an hour so they could critique me. He gave 6 of them bonus points on their next exam. I interviewed and had to present 2 problems to two professors who were acting as if they had never taken accounting before. I got the TA job, which waived my tuition and gave me a stipened on top of that.
Worked my ass off in grad school which was just a single year and had 9 A's and an A-. My paper to graduate was about 40 pages long. My classes ended in May and my job didn't start until January so I had 7 months. On days that I had Becker review (CPA exam) I would go to class for 5 hours a day and do 5 hours of homework a night. On days I didn't have class I would work on my paper for 10-12 hours a day. I did this until September.
While being a CPA each busy season I work about 280 hours of overtime between mid January to mid April.
I think I've worked pretty hard along the way.