AS Level Computing Revision Notes - Part 2

During my AS Level year I composed notes on computing for the OCR computing exams (F451 and F452) which eventually helped me to achieve an A in my first year. I am aware the syllabus changes in 2016 and the exam is now called "Computer Science", but hopefully not much has changed. I am hoping these notes help others to achieve their desired grades. There are no notes on pseudocode in both parts.