# 257 Computer Science A Level Paper-3 Topical Workbook

## Computer Science A-Level Paper-3 Topical Workbook

  

  
-    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 15 Hardware and Virtual Machines**  
15.1 Processors, parallel processing and virtual machines  
**Answer Section**  
15.2 Boolean algebra and logic circuits  
**Answer Section**

**UNIT 16 System Software**  
16.1 Purposes of an operating system (OS)  
**Answer Section**  
16.2 Translation software  
**Answer Section**

**UNIT 17 Security**  
17.1 Encryption, encryption protocol and digital certificates  
**Answer Section**

**UNIT 18 Artificial Intelligence**  
**Answer Section**

**UNIT 19 Computational Thinking and problem Solving**  
19.1 Algorithms  
**Answer Section**  
19.2 Recursion  
**Answer Section**

**UNIT 20 Further Programming**  
20.1 Programming paradigms  
**Answer Section**  
20.2 File processing and exception handling  
**Answer Section**

## Details

- **Price:** 1950.0 PKR
- **Vendor:** Read & Write
- **Tags:** A Level, A Level Computer Science, Computer Science, P3

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1950.00 PKR | In stock |

## Images

- 257 Computer Science A Level Paper-3 Topical Workbook

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> Source: [Read and Write Publications](https://readnwrite.org/products/article-no-257-computer-science-a-level-paper-3-topical-workbook)
> Updated: 2026-09-29