Video Lessons
Watch our expert video lessons — click any thumbnail to open directly on YouTube.
▶ YouTube
Encryption – Symmetric & Asymmetric
Full explanation of symmetric and asymmetric encryption methods.
▶ YouTube
Types & Methods of Data Transmission
Serial, parallel, simplex, duplex – full revision class.
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Packet Switching – Revision Class
Revision of packet switching and data packets in networks.
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Packet Switching & Data Packets Explained
How data packets work and travel through networks.
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Image & Audio File Size Calculation
Step-by-step file size calculations for images and audio.
▶ YouTube
How Bitmap Images Are Represented
Image & audio calculations for Cambridge IGCSE CS.
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Bitmap Images – Data Representation
Understanding how bitmap images store pixel data.
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File Size Calculation (Images & Audio)
Cambridge IGCSE exam-style file size problem solving.
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Sound Representation – Sampling Rate & Bit Depth
How computers represent audio: sampling rate, bit depth, resolution.
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IF THEN ELSE Statement – Complete Guide
Full beginner guide with examples and demonstrations.
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IF THEN ELSE – Practical Demonstration (Part 2)
Hands-on coding practice with IF THEN ELSE statement.
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IF THEN ELSE in Programming (Part 1)
Complete beginner guide with examples for O/A-Level & IGCSE.
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Arithmetic, Relational & Logical Operators
Use of operators in programming for O/A-Level IGCSE.
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Binary Addition & Overflow Error
IGCSE O-Level A-Level – binary addition with overflow explained.
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Negative Denary to Binary – Two's Complement
Converting negative denary numbers using two's complement.
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Two's Complement → Denary & Binary
Cambridge IGCSE O/A-Level two's complement conversions.
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INPUT & OUTPUT in Pseudocode
How to use INPUT and OUTPUT in Cambridge pseudocode.
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Two's Complement, Binary Addition & Overflow
Complete topic covering negative binary for O/A-Levels.
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Declaration of Identifiers & Data Types
How to declare identifiers and data types in programming.
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Uses of Hexadecimal Number System
Why hexadecimal is used in computer science – full explanation.
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Logical Shift LSL & LSR in 8-Bit Binary
Left shift and right shift operations in binary explained.
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Identifier Keywords in Pseudocode
Key differences between identifier keywords in pseudocode.
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Denary → Hexadecimal Conversion
Step-by-step denary to hexadecimal conversion method.
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Variable vs Constant in Programming
Difference between variables and constants with examples.
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Binary → Decimal Conversion
Converting binary numbers to decimal (denary) step by step.
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Binary → Hexadecimal Conversion
Converting binary numbers to hexadecimal with worked examples.
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Binary ↔ Decimal ↔ Hexadecimal All Conversions
Complete number system conversions in one lesson.
▶ YouTube
Boolean Logic – IGCSE / O-Level
Logic gates, truth tables and Boolean expressions explained.
▶ YouTube
Linear Search – O/A-Level
How linear search algorithm works with trace tables.