https://www.reddit.com/r/igcse/comments/132ld64/comment/l1r5c0d/?context=3
SUPER IMPORTANT LIFESAVER DOCUMENTS ^^
https://www.reddit.com/r/igcse/comments/13ahfl1/most_common_biology_atp_question_list_from_2015/
Chapter 1 - Characteristics And Classification
Chapter 2 - Structure Of Cells
Chapter 3 - Movement In and Out Of Cells
Chapter 4 - Biological Molecules
Chapter 7 - Animal Nutrition !!!
Chapter 9 - Transport In Animals - Important
Chapter 10 - Disease And Immunity
Chapter 11 - Gas Exchange In Humans