You do not need to buy any books, but they can certainly be helpful. If you would like to get one, here are some I would recommend for:

• KS3 Maths,
• Maths GCSE - Foundation,
• Maths GCSE - Higher,
• KS3 Science,
• Double Science GCSE,
• GCSE Physics.

The CGP range are excellent and very reasonabley priced. Each book has a link to Amazon.co.uk.

Maths KS3

KS3 Mathematics Revision Guide: Levels 5-8 - CGP

KS3 Maths: Workbook and Answers Multipack - Levels 5-8 - CGP

Maths GCSE - Foundation

GCSE Mathematics Revision Guide: Higher - CGP

GCSE Mathematics: Complete Revision and Practice Pt. 1 & 2 (Complete Revision & Practice) - CGP

Maths GCSE - Higher

GCSE Mathematics Revision Guide: Higher - CGP

GCSE Maths Workbook/Answers: Higher - CGP

GCSE Maths: Higher Level - Letts

Science KS3

KS3 Science: Revision Guide - Levels 5-7 - CGP

KS3 Science: Workbook/Answers (Levels 3-7) - CGP

KS3 Science: Complete Revision and Practice (Complete Revision & Practice) - CGP

Double Science GCSE

KS4 Chemistry: Workbook and Answer Book - Higher - CGP (Foundation also available)

KS4 Physics: Higher Workbook and Answer Book (Multi Pack) - CGP (Foundation also available)

KS4 Biology: Workbook and Answer Book - Higher (Multi Pack) - CGP (Foundation also available)

Physics GCSE

GCSE Physics Revision Guide - CGP

GCSE Physics Complete Revision and Practice (Complete Revision & Practice) - CGP