From the age of around 8 to 13 I was educated at schools in Romford, an area of Greater London where the population consisted predominantly of "blue collar"/"working class" people, a number of whom were employed by Fords in Dagenham.
I remember that between the age of around 8-10 we did classroom-based "exams" which tested our arithmetic, composition, spelling, etc., but I don't recall feeling pressured in any way. I was very good at English - always top or near the top - but very bad at arithmetic - always bottom or near the bottom. I did feel a little disappointed that my arithmetic had let me down, but it certainly didn't stop me sleeping or eating - and I don't think it did any of my classmates either. Thinking about it, though, I expect it was pretty upsetting to be the person who did badly in every subject and came 48th in the class. So I suppose any sort of competitive element is bound to have a negative effect on somebody - but particularly if the sole emphasis of the school is on academic achievement. But at the junior school I attended there were lots of other opportunities to achieve - netball, swimming and football clubs and a choir - and each year there was a chance to participate in a quite sophisticated (for our age) musical for those that enjoyed performing (or helping backstage, or assisting with painting the scenery, etc.).
Of course, after leaving junior school, we were encouraged to work hard and study for our exams but there wasn't the sort of hysteria that you see these days - and I actually think the level of literacy and numeracy was much higher then. I went to a secondary modern school, but a look at my old school magazine shows that many pupils were well able to put an interesting and well constructed piece of writing together. Also, there was a junior and a senior choir - and a French choir - and several after-school and lunch time activities which were purely for interest and enjoyment - with no suggestion that they existed purely to enhance exam results.
I'm not sure that the current obsession with testing and exams - in so many subjects now - is conducive to real learning but, even if it is, I think it is wrong that young children should so early on in life be forced to become part of the "rat race".