I got 9 good enough grades at O Level, without putting effort into it, skipping classes, no homework, no revision.
I failed awfully at A Level, I got art in the first year only because I could draw easily. The other classes I didn't turn up to and didn't hand in homework. They wanted to throw me out after the first year but my mum begged them and I did hand in a few grade A bits of work. I still didn't keep it up! Took one look at the exam papers and realised I couldn't answer a single question and got U's.
I did work part time in a supermarket at the time and worked very hard there!
After failing my A Levels I travelled and worked abroad, always put in loads of effort and interested in what tasks I did. returned to the UK after a few years and started in a department at a supermarket, a few months later they were talking to me about management and university schemes, where you work and study at the same time.
instead I went to uni as an adult student, mid 20's, and did fine with minimal effort. Don't know what's wrong with me, I've always read text books for fun, except the ones I'm meant to do. Anyway I had lots of fun and a part time job, that I worked hard at. I spent a few months employing some friends for a bit of work for a company. I temped in the holidays and was always sent back to the same company, who then offered me a job when graduating. I had my talents, worked hard and had a good attitude.
Quickly moved up the pay scales and did really well on technical courses. Then gave up work for a decade but have found it easy to get back into work and have just been offered a very nice contract rate. Better than many old friends who did well at school and university.
So no 
My home life was good, I had motivated friends, everyone around me was well educated, good schools, no shortage of money, amazing environment and holidays. I was a very lucky individual. Everything was perfect but for some reason formal education and me has never mixed well.