Actually, I eventually managed to "redeem" myself [academically]- in my early 30s - by going to Evening Classes and taking a "clutch" of Scottish Highers - among them, English & History - plus Arithmetic at Ordinary Grade (the approximate equivalents of the former GCE 'A' and 'O' Levels, respectively, South of the Border).
Sadly ... however,by the mid 1970s, *such qualifications were being obtained by a greater number of youngsters than had been the case back in 1961 when I left school. And so, their value diminished ... coinciding with an increase in demand for graduate applicants to fill promoted posts as a greater number of people competed for fewer jobs.
But, if nothing else,it gave me a sense of achievement and much-needed self confidence.