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A Level Computer Science Paper-3 Topical Workbook 257 professional design suitable for schoolA Level Computer Science Paper 3 Topical Workbook 257 Questions order new to old Mark Schemes included All Variants TABLE OF CONTENT UNIT 1 Data Representation 13. 1 User defined data types Answer Section 13. 2 File organisation and access Answer Section 13. 3 Floating point numbers, representation Answer Section UNIT 14 Communication and Internet Technologies 14. 1 Protocols Answer Section 14. 2 Circuit switching, packet switching Answer Section UNIT