Need an advice and help

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im study Cambridge ol IGCSE
Im taking Combined science for my Oct/Nov session so i wanted to ask what is the code for it and is it really hard when i take it as self study subject as my school doesn't teach this subject + if i want to buy the book which one is the best...and lastly, which syllables do i follow 2019-2021 or 2022.

i really need help and response cuz i need to decide if im taking it or not...Thanks in advance:D

and if u have a ss of the book can u plz post it here
 
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