Black + White = ? =D

Hello .. Wow Xing hui sister buy books le worh ..
Hahas .. ^^
Now then I know Pure science and COMBINE science the books
thickness different by so much .. hahas :)
Pure Science like 1 book 150+ more pages compared to Combine Science.
2 Books like 300+ pages more .. SIAO SIA . I pure science . LOL

Sister study F&N worh .. The book is the most expensive de worh .. hahas :)
CHEF WORH .. MWHAHAHA .. Good luck ah ^^