I had a tough time myself at school - plenty of hard proof most teachers didn't like me, even though I was a swat, and never made good friends. Give a dog a bad name and so on.
Was finding it hard to be positive about school experience for my kids. Then I discovered that attending evening classes gave me a great chance to 'get it right'. I always make a point of meeting the teacher before signing on dotted line and choosing course only if I think I'll like teacher. What I take away from course in terms of its actual content is just a bonus - my real agenda is just being a well-accepted member of the class. Recommend trying this to anyone who felt they were labelled as unteachable at school and wants to break cycle so their children don't pick up on their bad vibes.