AQA pastpaper collector here, i need help with some info.

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I couldn't find any AQA forums so i am just gonna post it here, sorry for that.

i am gonna gather all the past papers of all the specifications and put it up on google drive, but i am facing problems with understanding the specifications and tiers and sub-tiers each subject has, which is vastly different from EDEXCEL internationals (IGCSE and IAL standards) that i am used to. So i was hoping for someone who could help me with it, in exchange i'll make it available to the world. TIA and the pdfs of science books that i found on the internet will also be offered to anyone who contributes.