I wonder how much education one really needs. I had jobs in industry which started fairly big (nothing unusual in that in my field) and progressed inter (much) alia to sole responsibility for accounts, including payroll, for some 600 workers. Yet I had a miserable clutch of O Levels (including one re-sit) and 2.50 A levels (ditto). As I said before (do pay attention at the back) I have never passed any exam in maths.
I only improved my qualifications, initially for three years, at age 39 and went on to teach in higher education (i.e. post-A Level). I needn't have bothered to study as qualifications did not seem prized at all and some colleagues only possessed things like Honorary Membership of the Institute of Work Study, or whatever.
As regards typos a lot may be down to "proof reader's error", the bane of authors, as well as the unnatural mode of the keyboard.
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