you need to get hold of the mark scheme for the papers that you have done,this will give you an idea of where you can lose or gain points. You could also try and find the exam report for the exam you did . I would also suggest buying or borrowing the ocr critical thinking book , it has exam questions at the back ( i cant remember the title) this was a great help to my daughter. I got the book at waterstones. I hope this helps you, good luck next week.