can someone please tell me do the coursework a booklets or experiment copys get corrected by an official corrector or just your teacher
As far as I'm aware they get sent away to an official corrector
your teacher has to check to see how many experiments you have completed and then she/he writes the number out of 30 into the green booklet. an examiner may check your experiments but sometimes they don't (it depends on the examiner)
Your experiment copies stay in the school, and an examiner may or may not come to check them (they probably won't). The Coursework A and B booklet gets sent away and is corrected with your actual exam paper.