changed title. Old title: maybe a weird question but…
Can I somehow achieve to do my homework for school better by practisicing lucidity?
Is there any technique that can make a person being better at something (homework or whatever) in real life?
Well, first of all: do NOT try lucid living as a method to enhance your homework skills. You’ll become even slower. Homework is made to turn you into a fast processing machine, maths must be a reflex, not a set of concept.
Now, if you wanna practise, you can always ask your DCs to help you learning. I don’t think you’ll be making something useful of your dreams, but that’s up to you. Research has proved that your skills improve if you train them on your dreams, so you could use lucidity to choose what would you be training instead of leting your SC make the choice.
I don’t think it will be very enjoyable, but then again, it depends on how you face your dreams… 
Lucid dreaming can be used for practising things, and it’s true that the things you practise in lucid dreams are better performed in real life as a result. Also I remember reading in “Exploring the World of Lucid Dreaming” by Stephen LaBerge, about a student who used lucid dreaming to improve his math skills when he was learning about vector space in school, so I think that you could definitly use lucid dreams as a study aid 
You can improve mental skills (eg. maths), but you won’t be able to improve anything physical (eg. being able to run faster).
Remember though - don’t replace your waking study time with LD’ing study time. If I were you, I’d practice during the waking hours, and then have fun and relax in your LD’s 
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Hmmm… i dont agree exactly with Sureal. It’s possible to change your physical skills but it must be a great belief that you can do that. I believe it’s achievable
I don’t think you can improve your muscular strength this way. What you might be able to do is to improve your nerves. Take for example guitar playing: you won’t develop any endurance this way, but it might help you improve speed and coordination.
You cannot improve muscle strength per se, but you can strengthen the motor areas of the brain that control those muscles…so it’s kind of like ‘virtual practise’.
A friend of a friend whom works in a laboratory often uses his lucid dreams to practice setting up complicated glassware arrangements. If he drops them, he simply summons a new beaker/flask and tries again.
Seems to be helping his mental reflexes in the lab…
I think you can practice, but you can’t just know something about what you don’t know and if you do you already know and didn’t realize what it meant.
I had a dream once , where I asked a character to tell me information about what he was interested in, although some reason I came out with the word flaggs, I don’t even want to know about that again, I had some boring History Classes and I really meant Jewels, and he was like, “You don’t know enough to know anything about it.” That was a part of me, telling me that I don’t know anything about it so therefore I could not answer myself. It was odd but very true. And in a way, that would be something he’d say just becuase he didn’t feel like talking.
It was pretty funny actually. I was talking to Knuckles from Sonic adventure. SO you have to know before hand what the info is before trying to do your homework like you would in real life. I guess or just use it to practice. But if you don’t know what you were learning, don’t bother with it. I had had several history classes on flaggs, I don’t know any of it anymore. I can’t remember a single thing. And I wouldn’t really use it for everything in my life, but you could use Lucid dreaming to practice homework and that’d be it. You’ll only get results about what you know and maybe work out something with what you know, but you can’t summon your teacher to come around and just give you the answers to everything. At least that’s what I believe.