The Topical Science Primary 3, 4, 5 and 6 series is targeted for primary school science learners in Singapore schools with the aim of attaining a certain level of proficiency to handle the Primary School Leaving Examination. The booklets contain a wide assortment of science practices which are commonly tested in primary school tests and examinations. The structural exercises are carefully designed to allow students sufficient depth and breadth in science practice. The content has been meticulously created to suit the Singapore context, but overseas learners may also utilise the exercises to improve their mastery of science. We hope the students will find the exercises and their learning journeys interesting and fruitful.