My best school year was my last. I started in January 1951 and left in February to move to another country and a new life. Never went back to school as a school child ever again. And I was fourteen at the time.
Despite the lack of a formal education I've really been involved in study of one type or another all my working life - and beyond into retirement. I undertook various courses with a bevy of employers. Went back to formal schooling: English, History, Economics, Geography in my early thirties and found I relished studying. This lead to writing and speaking as life-long loves.
The result? I've had a fantastically adventurous life, serving in the Navy, in Aviation, in Telecommunications, Transport, Electrical Supply, the Police - and even a stint as an Antarctic expeditioner. So don't ever think that you've got to do well in your school years to do well in your life overall.