I think the key to success, rising to the top, getting on - call it what you will - lies in having drive, ambition and a clear, even blinkered, image of where you want to go.
In primary 1, I was one of 6 children selected to take part in trials of intelligence tests, which lasted until we left Primary. Usually a researcher came twice a year and we had to complete word games, puzzles and logic problems. As we got older there were also tests based on interpretation of poems and written pieces and mathematical problems. I thought it was great fun. When we sat our control exam (Scottish equivalent of the 11+) I thought it was a breeze, no doubt because I had been completing the same kind of test for years.
Neither, the children nor the school were given the results of the trials, nor did we get the results of the control exam except that we had Passed and were going to High School or Failed and off to the Junior Secondary but when we arrived at secondary school we were streamed according to the results into five classes. The first name called from the list was mine. I was not fond of school but nonetheless went on to 'do well' - top of the year in some subjects, 100% for maths twice. But I found a job and left school at 15, was demoted to 'temporary staff' when I got married at 19, forced out when I was pregnant at 23 and have worked since in mainly low paid voluntary sector jobs.
So, undoubtedly intelligent, basically lazy and not ambitious or singleminded enough to make it to the top in any field, especially in the days when the only career option offered to clever girls was teaching.
Anyway, when did success guarantee lasting Happiness?