This text has been completely updated in line with the latest science National Tests. It continues to provide a comprehensive approach to exam success with its combination of study support and exam practice. Written by chief markers and experienced teachers, the book provides an authoritative but practical approach to revising for KS3 National Tests. It is divided into short revision sessions organized by level so students can use the book wherever they are in their KS3 course. Check yourself sections throughout ensure revision is active and effective. Test questions are provided at every level with model answers and practical advice from test markers on how to boost grades.