I would say around 2,5kg (5,5 pounds)
I don't really know if that is too heavy or not because at the moment i am using a 5 year old crappy laptop that only weights 1,6kg. So I can't really compare it to a gaming laptop. What would you recommend?
And with the battery life of course as long as possible, but for school I would say above 6 hours for general use.