Computer science ocr component 1Watch this thread
unfortunately, OCR probably has the most vague specification in the universe. So "it" cannot be explained at all. However, via assumption, you can figure out what they could ask about whenever you are in an exam and by thinking about it, you can then research it and make notes on it. You can use PMT, this site and my question bank . I may haven't been helpful, but that's all I could do I am afraid. Good luck!