常識 & Science are using the same series of books from the same publisher (Educational Publishing House Ltd). They just call 常識 in English as Science. 中文書是今日常識新領域. English book is New General Studies. GHS also teaches GS in Cantonese & English.
Hmm, I guess it's not easy (or no need) to distinguish between science & GS in junior primary levels. As I said the English books are called General Studies as well. They (the English ones) talked about animals, weather etc. which you could find the same topics under 常識 in Chinese.