WJEC A-Level Computer Science
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Assessment and exam guidance
What Gets Top Grades
Knowledge & Understanding
Demonstrates comprehensive and accurate knowledge
- Uses correct subject-specific terminology
- Shows detailed understanding of concepts
- Makes accurate connections between topics
- Demonstrates depth beyond surface-level knowledge
Application
Applies knowledge effectively to new contexts
- Selects relevant knowledge for the question
- Adapts understanding to unfamiliar scenarios
- Uses examples appropriately
- Shows awareness of context
Analysis & Evaluation
Develops sophisticated analytical arguments
- Constructs logical chains of reasoning
- Considers multiple perspectives
- Weighs evidence to reach justified conclusions
- Acknowledges limitations and nuances
Key Command Words
Give a single fact or term
Name, select, or recognise
Set out main features briefly
Give an account of what something is like or what happens
Give reasons with developed cause→effect chains
State similarities AND differences (both required)
Examine in detail showing cause→effect→consequence chains
Weigh up BOTH sides, reach JUSTIFIED conclusion
Make judgments about importance with justification
Show formula→substitution→calculation→answer with units
Tips and common mistakes
Common Exam Mistakes
Pitfalls to avoid in your exams
- •Confusing binary and hexadecimal place values
- •Incorrectly handling binary addition carry bits
- •Misapplying algebraic rules, e.g., sign errors
- •Forgetting to simplify Boolean expressions fully
- •Not showing working in calculations, leading to loss of method marks
Top Examiner Tips
Expert advice for exam success
- •Practice conversions regularly to build speed and accuracy
- •Always show your working for arithmetic and algebra to gain method marks
- •Learn Boolean algebra laws (commutative, associative, distributive, De Morgan's) and apply them systematically
- •Use substitution to check algebraic solutions
- •Familiarize yourself with common exam question formats, such as converting between bases or simplifying logic expressions
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