My latest workbook co-written with another two authors is finally in the market. It is published under Marshall Cavendish (or better known as Federal Publications).
Practise 'n' Excel Science Form 4 is based on the latest KBSM syllabus in English language.
Pros: SPM-type questions, reasonable price, reliable publisher, good looking cover (different from the typical workbooks you normally see in the bookshops).
Cons: Quality of the paper used, the key points are too wordy (preferably add in more pictures or diagrams).