i have that to but its my second i did C2 first! if you are sitting C1 AQA there is only one past paper because they have recently changed the syllabus, however the previous exams also contain some similar questions so they are still useful. you'll need to know how to work out how many neutrons there are in an atom by looking at the periodic table (mass number-proton number). revise things about limestone crude oil-polymerisation+cracking, emulsifiers, extraction of metals, about how the earth became and oils.
Do you not have a textbook type thing with all the topics covered? If not you should ask your teacher if you could buy one or where to get one. I often just memorise the topics from the book and do a few practice questions and an A/A* isnt hard at all :)