An unsuccessful learning experience

My unsuccessful learning start was when I was 16 and starting my Maths A direct. We had 2 teachers who fragmentise the course material between them, one taking pure maths and the some other applied maths. The teacher in charge of the pure maths, which had enjoyed up to A level and received an A for (in the mean solar days before A* existed, so top marks in other words), was a issue man who had just qualified from his PGCE and came to teach us A level maths.The main problem wasnt the teachers age, Im sure plenty of young teachers are rattling capable, the issue was more that he didnt have the self confidence to base of operations up to the more lively characters in the menage. He didnt know how to resolve when a pupil would try and disrupt the class by lecture ab bring out something irrelevant, like last nights television, therefore that pupil would carry on talking and valuable lesson time would be wasted. Even when he did crave people to be quiet a fair amount of rucku s had already been made.The other issue was that he didnt know his subject, in this cocktail dress pure maths, well enough. I remember clearly one day the entire class followed him working out a complicated equation, writing down his calculations as we went along. After using up two blackboards worth(predicate) of calculations he came to his answer, only for one of the pupils to check the answers in the back of out text book and announce it was the wrong answer. By then he had erased half of his calculation and he couldnt go back to see where he had made a mistake.It wasnt the only time his calculations were wrong or he was unsure of his subject, which made the pupils very nervous. The short term result was that my class was time-tabled extra maths lessons to try to cover for this teachers lack of covering his subject, with the other maths teacher working longer lesson hours to try to get us through the exam. The longer term result was that the Pure maths results for that course of study were far lower than expected and the teacher was moved down to belief 11-12 year olds maths.