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Jigsaws are great for making curved or detailed cuts, but since jigsaw blades are so small they're not idea for making straight cuts as the blade will tend to wander. Also, jigsaw blade reciprocate, meaning you won't be able to cut anything that's thicker than the blade is long.
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But mum won't let me get a circular saw
I would suggest a mitre box and a good hand saw made fo the mitre box. Hope this helps.