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For INFO 3, i recommend doing past papers to identify topics you are struggling in to identify topics that are recurring every 1-2 years so you can revise these also.
For INFO 4 ask your teacher's if they have any example past coursework's that got high marks and use these to help you.
when doing past papers, are you supposed to read over the pre-release for that year. If so, wouldnt that take long every time you do a new past paper for a new year.