KiasuParents - Parenting in Singapore

Can someone pls help ...my DS has scored very low for his CA exams .... eindly recommend some good assessment books /websites for Secondary 1 (Express) subjects :

1. English : Living through Literature (Robert A Nimmo - Shinglee Publishers)
2. Maths : Discovering Mathematics (Chow Wai Keung - Star Publishing)
3.Science : In Science ( Ho Peck Leng - Star Publishing )

Thank you

I feel that for maths maybe the perfect focus for sec 1 exp/special, or something like that is not bad. The questions are grouped according to topic and they get to practise like exam. Answer key is not too bad. Got working. I bought it for my ds too.