Unless you're Bill Gates, Sir Alan Sugar, or even Simon Cowell. Don't drop out, you'll likely regret it later.
But hey, plumbers make a great living these days...
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Also, I agree with Sapi, by the sounds of it, with all those tutors, you sound like you're trying to hit way above your level (however high or low that might be).
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One final thing, school - it's something to do with your time, and if you drop out - it's not as if you can hang out with your friends, because they're going to be... at school.
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