Great success in examinations does naturally not as a rule go with originality of thought.
I never 'say' anything in my work. I invent a world. Let others decide what is being 'said'.
I don't write down my experiences, but I have a very decent memory. I have tons of books in which I write down phrases as they occur to me. That's how I write songs. I'll need a line and I'll go through the books and find it, the right rhyme and everything.