Help needed!!

Right, i did my science for 1 year early and achieved an A however im fully grateful but im a consistant A* student and alway get 71/70 85 marks though when i got my paper back it seemed to me that i achieved 51/85 which i thought i done really well in unless those stupid lazy unexpirenced ocr science examiners didnt mark my paper properly like did my greek gcse remarked from a C to A* cos im native but do u think i should get it remarked or im i just unlucky with examiners??