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algorithms
http://www.visualgo.net
Diagnostic Multiple Choice Questions MCQ
https://diagnosticquestions.com
CAS Binary Decimal and Hex self-marking tests
https://community.computingatschool.org.uk/resources/4653/single
BBC revision GCSE Computer Science
https://www.bbc.com/bitesize/guides/z67j2nb/revision/1
Binary Data
https://www.khanacademy.org/computing/computer-science/how-computers-work2/v/khan-academy-and-codeorg-binary-data
CPU Memory and Input Output
https://www.khanacademy.org/computing/computer-science/how-computers-work2/v/khan-academy-and-codeorg-cpu-memory-input-output
Make Code with Microbit
https://makecode.microbit.org/
Introduction to Turtle Programming
http://interactivepython.org/runestone/static/CS152f17/PythonTurtle/intro-HelloLittleTurtles.html
https://www.khanacademy.org/computing/computer-science/how-computers-work2/v/khan-academy-and-codeorg-cpu-memory-input-output
http://interactivepython.org/runestone/static/CS152f17/MoreAboutIteration/ThewhileStatement.html
https://www.w3schools.com/python/python_while_loops.asp
http://interactivepython.org/runestone/static/CS152f17/PythonTurtle/intro-HelloLittleTurtles.html