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Gears and other mechanical systems. There are been questions every year for (at least) the last three years where a good knowledge of gears and mechanisms has been useful, so this is probably one of the safest areas to revise. Obviously, you're not going to be expected to know a billion different types of gears, but I would definitely have a look at a few (maybe some less conventional ones for creativity), specifically in terms of power transmission. This website is bloody brilliant: http://507movements.com/
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Materials and adhesives. 20% of your marks in Section 2 come from your choice of materials, so just learn the basic materials used in industry, their advantages and disadvantages, etc. You honestly don't need to do a lot here (from what I remember, I literally just learnt the names of 3 really strong glues) but you need to remember to include them in the exam, as well as justification.
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Construction methods. Again, I didn't really do a lot here myself, but it's 40% of your marks in Section 2. Do have a look through industrial manufacturing processes, but I think the emphasis here is on your ability to think of logical and practical processes rather than learning industrial techniques off by heart. So basically, as long as you can show that your design is practical to make, you should be fine.